For a Company That Is Engaged in Exports and Imports

For a company that is engaged in exports and imports

A) a thorough knowledge is required of tariffs because they can vary between countries
B) tariffs do not affect the prices of commodities
C) tariffs are usually a flat rate imposed on all different types of goods
D) if tariffs are high, companies may have to increase export prices to compensate
E) a U.S. company that is purchasing goods from overseas need not worry about U.S. tariffs