Which international economic organization is made up of leaders from the world’s largest economies?

G7.

Explanation:

serves a forum of world's major economies that share main objective of developing global policies that will help with the world's challenges

A) G 20.

Explanation:

There are a number of organisations whose members include the world's most powerful economies, but the G20 summits are when the leaders of the 20 most powerful economies to discuss and possibly decide on global economic policy

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