In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: The Pook Turtles, or City-class gunboats to use their semi-official name, were war vessels intended for service on the Mississippi River during the American Civil War. They were also sometimes referred to as "Eads gunboats." The labels are applied to seven vessels of uniform design built from the keel up in Carondelet, Missouri shipyards owned by James Buchanan Eads. Eads was a wealthy St. Louis industrialist who risked his fortune in support of the Union., Watercraft are water-borne vehicles including ships, boats, hovercraft and submarines. Watercraft usually have propulsive capability (whether by sail, oar or engine) and hence are distinct from a simple device that merely floats, such as a log raft., The Mississippi River is the chief river of the largest drainage system on the North American continent. Flowing entirely in the United States (although its drainage basin reaches into Canada), it rises in northern Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains all or parts of 31 U.S. states and 2 Canadian provinces between the Rocky and Appalachian Mountains. The Mississippi ranks as the fourth longest and fifteenth largest river in the world by discharge. The river either borders or passes through the states of Minnesota, Wisconsin, Iowa, Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, and Louisiana., On boats and ships, keel can refer to either of two parts: a structural element that sometimes resembles a fin and protrudes below a boat along the central line, or a hydrodynamic element. These parts overlap. As the laying down of the keel is the initial step in the construction of a ship, in British and American shipbuilding traditions the construction is dated from this event. Only the ship's launching is considered more significant in its creation., The American Civil War was a civil war in the United States fought from 1861 to 1865. The Union faced secessionists in eleven Southern states grouped together as the Confederate States of America. The Union won the war, which remains the bloodiest in U.S. history., A gunboat is a naval watercraft designed for the express purpose of carrying one or more guns to bombard coastal targets, as opposed to those military craft designed for naval warfare, or for ferrying troops or supplies., A civil war, also known as an intrastate war in polemology, is a war between organized groups within the same state or country, or, less commonly, between two countries created from a formerly united state.
The aim of one side may be to take control of the country or a region, to achieve independence for a region or to change government policies.
The term is a calque of the Latin "bellum civile" which was used to refer to the various civil wars of the Roman Republic in the 1st century BC., A gun is a normally tubular weapon or other device designed to discharge projectiles or other material. The projectile may be solid, liquid, gas or energy and may be free, as with bullets and artillery shells, or captive as with Taser probes and whaling harpoons. The means of projection varies according to design but is usually effected by the action of gas pressure, either produced through the rapid combustion of a propellant or compressed and stored by mechanical means, operating on the projectile inside an open-ended tube in the fashion of a piston. The confined gas accelerates the movable projectile down the length of the tube, imparting sufficient velocity to sustain the projectile's travel once the action of the gas ceases at the end of the tube or muzzle. Alternatively, acceleration via electromagnetic field generation may be employed in which case the tube may be dispensed with and a guide rail substituted., The Confederate States, officially the Confederate States of America (CSA or C.S.), commonly referred to as the Confederacy, was an unrecognized breakaway country of 11 secessionist slave states existing from 1861 to 1865. It was originally formed by seven slave states  South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas  in the Lower South region of the United States whose regional economy was mostly dependent upon agriculture, particularly cotton, and a plantation system that relied upon the labor of African-American slaves., Captain James Buchanan Eads (May 23, 1820  March 8, 1887) was a world-renowned American civil engineer and inventor, holding more than 50 patents., USS Louisville was a City - class ironclad gunboat constructed for the U.S. Army by James B. Eads during the American Civil War . ( While initially owned by the Army , the City Class gunboats were commanded by U.S. Navy officers , and were eventually transferred to the Navy . ) Louisville was built at St. Louis , Missouri , by James B. Eads in 1861 , under contract with the War Department for the price of $ 89,000 . Designed by U.S. Navy `` Constructor '' ( Naval Engineer ) Samuel M. Pook , she was accepted 15 January 1862 ; and commissioned 16 January 1862 , Commander Benjamin M. Dove , USN , in command . Despite being designed by naval personnel , budgetary concerns led the War Department to fund construction of the Louisville with Army funds . As such , she was turned over to Army command upon completion and joined the Army 's Mississippi River Squadron . Eventually the entire western river flotilla would be transferred to Navy command ., Secession (derived from the Latin term "secessio") is the withdrawal of a group from a larger entity, especially a political entity (a country), but also any organization, union or military alliance. Threats of secession can also be a strategy for achieving more limited goals., Subject: uss louisville , Relation: instance_of, Options: (A) action (B) agriculture (C) artillery (D) boat (E) century (F) change (G) city (H) civil war (I) class (J) construction (K) country (L) craft (M) device (N) drainage basin (O) energy (P) engine (Q) event (R) fashion (S) field (T) gas (U) government (V) group (W) gulf (X) gun (Y) gunboat (Z) history ([) limited (\) line (]) material (^) may (_) name (`) naval warfare (a) raft (b) rapid (c) region (d) river (e) secession (f) seven (g) ship (h) structural element (i) system (j) term (k) two (l) union (m) water (n) watercraft (o) weapon (p) withdrawal
ship