By assigning production quotas among its members，_____ tried to limit the overall crude oil supply of the world for the purpose of maintaining higher oil prices.
A、the Council of Ministers
B、The European Parliament
C、The European Union
D、APEC
【正确答案】：D
【题目解析】：By assigning production quotas among its members，OPEC tried to limit the overall crude oil supply of the world for the purpose of maintaining higher oil prices.参见教材P40。