The nations of opec chose to cooperate primarily in order to lead regional development efforts encourage the growth of trade among one another provide a forum for international justice manage the supply of a natural resource assure mutual self-defense from attack

D. manage the supply of a natural resource

Explanation:

OPEC is the abbreviation of Organization of the Petroleum Exporting Countries which is established at 1960. Its primary objective is coordinate the petroleum prices and ensure the market stabilization for petroleum products. In today’s world they are highly influential powers in the petroleum products. OPEC member countries are present in Asia, Africa, North America and South America such as Algeria, Angola, Congo, Ecuador, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, Saudi Arabia, United Arab Emirates and Venezuela.

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.

the answer is c i just put d and i got it wrong so yeah its d