The goal of increasing production of manufactured goods in trades between European nations was part of what plan

Marshall Plan

Explanation:

The Marshall plan was an economic recovery plan that sought to promote a recovery program for Western European countries that were damaged by the war. The main objective of this plan was for these countries to be able to initiate a rapid and well-established economic recovery, allowing for greater economic movement and increasing trade and commercial relations between countries, especially in relation to manufactured products.

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i believe your answer is d)