Q: 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: A cannon (plural: "cannon" or "cannons") is any piece of artillery that uses gunpowder or other usually explosive-based propellants to launch a projectile, which may or may not be explosive. Cannon vary in calibre, range, mobility, rate of fire, angle of fire, and firepower; different forms of cannon combine and balance these attributes in varying degrees, depending on their intended use on the battlefield. The word "cannon" is derived from several languages, in which the original definition can usually be translated as "tube", "cane", or "reed". In the modern era, the term "cannon" has fallen into decline, replaced by "guns" or "artillery" if not a more specific term such as "gun", "mortar" or "howitzer", except for in the field of aerial warfare, where it is often used as shorthand for autocannon., An 'electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this is the conversion of mechanical energy into electrical energy and is done by an electric generator., A rotary cannon, rotary autocannon, or Gatling-type cannon is a rapid-firing weapon that utilizes multiple barrels in a rotating cluster to provide a sustained rate of fire greater than single-barreled machine guns or automatic cannon of equivalent caliber. The loading, firing, and unloading functions are performed simultaneously in different barrels as they rotate, and the rotation also permits the barrels some time to cool. The rotating barrel cluster on most Gatling-type guns is powered by an external force such as an electric motor, although gas-operated versions have also been developed., The M197 electric cannon is a three - barreled electric Gatling - type rotary cannon used by the United States military ., Subject: m197 electric cannon, Relation: subclass_of, Options: (A) angle (B) artillery (C) autocannon (D) cannon (E) electric motor (F) energy (G) fire (H) gas (I) machine (J) mortar (K) plural (L) range (M) rotation (N) single (O) time (P) type (Q) warfare (R) word
A:
autocannon