trade agreements are helpful because they allow countries to\no trade for necessary goods.\no increase trade…

Brief Explanations:

Trade agreements aim to facilitate trade. They allow countries to access goods they need by trading. Increasing trade - tax revenue is not the main goal as they often reduce tariffs. Influencing foreign trade is a broad and less specific reason compared to trading for necessary goods. Creating new trade barriers goes against the purpose of trade agreements.

Answer:

A. trade for necessary goods.