The correct answer is A)It greatly reduced foreign trade, which would have helped American companies.
A tariff is a tax on an imported good. The goal of implementing a tariff is to protect the business interests of domestic companies. This type of tax was thought to have helped American businesses during the Great Depression. However, it had the opposite effect.
Due to the tariffs, many foreign businesses reduced or completely eliminated their trade with the United States. This reduction in trade hurt American businesses, as it limited their market in terms of who they could sell their goods too.