What Is One of the Major Shortcomings of Using Tariffs

What is one of the major shortcomings of using tariffs or quotas to "save American jobs"?

A) Trade barriers protect the development of new technology, but the new technology eliminates jobs.
B) Import restrictions alter the composition of domestic employment, but they have minimal effect on the amount of domestic employment.
C) The volume of trade with other nations is limited to a few industries, so trade restrictions would not increase national employment.
D) Major American firms have produced many products in other countries, and would not hire more domestic labor when trade barriers are imposed.