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: Fairmount Heavy Transport is a Dutch shipping company that operates two semi-submersible heavy transport vessels, Fairmount Fjord and Fairmount Fjell. Both are being converted at Malta Shipyards in 2007/2008. Commercial management is performed by Fairmount Heavy Transport itself, since 1 August 2007 independently from Fairmount Marine. Fairmount Heavy Transport was founded in 2005 and based in Rotterdam. It is listed on the Oslo Stock Exchange., Rotterdam is a city in the Netherlands, located in South Holland, within the RhineMeuseScheldt river delta at the North Sea. Its history goes back to 1270 when a dam was constructed in the Rotte river by people settled around it for safety. In 1340 Rotterdam was granted city rights by the Count of Holland and slowly grew into a major logistic and economic centre. Nowadays it is home to Europe's largest port and has a population of 633,471 (city proper), ranking second in the Netherlands. The Greater Rijnmond area is home to approximately 1.4 million people and the Rotterdam The Hague Metropolitan Area makes for the 168th most populous urban area in the world. Rotterdam is part of the yet larger Randstad conurbation with a total population of 7,100,000., Oslo Børs (OSE: OSLO) offers Norways only regulated markets for securities trading today. The stock exchange offers a full product range including equities, derivatives and fixed income instruments. Oslo Børs is the only independent stock exchange within the Nordic countries., Fairmount Marine is a shipping company in the Louis Dreyfus Group . The company operates 11 heavy transport vessels , including two self - propelled semi-submersible ships which are owned by Fairmount Heavy Transport while the mother group operates six anchor handling tug supply vessels and three semi-submerisible barges . The main operations involves transport of offshore installations such as Floating production storage and offloading vessels ., Subject: fairmount marine, Relation: headquarters_location, Options: (A) europe (B) malta (C) norway (D) oslo (E) rotterdam
rotterdam