Is am organization that promoted trade and economic cooperation what is it

The correct answer is the World Trade Organization.

If there are no options for the question, we answer it as an open question.

The organization that promotes trade and economic cooperation is the World Trade Organization (WTO).

The WTO is an international organization formed by most of the countries that support and promotes free trade. The WTO set rules for maintaining fair trade worldwide. Nations agreed on many different terms during negotiations and when they reach an agreement, their parliaments or congresses. In the case of controversies, the WTO gathered the nations in conflict to reach a solution.  

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."