Correct Answer: (b) China
Solution:The Organization of the Petroleum Exporting Countries (OPEC) is federation of petroleum exporting countries. The members of OPEC are Iran, Iraq, Kuwait, Saudi Arabia, Venezuela, Republic of the Congo, Equatorial Guinea, Libya United Arab Emirates, Algeria, Nigeria and Gabon. Earlier Indonesia was the member of OPEC but Indonesia suspended its membership in January 2009, but finally suspended from 30th November, 2016.