The "unfair-competition" argument might be cited by an American who believes that

a. almost every country has a comparative advantage, relative to the United States, in producing almost all goods.
b. young industries should be protected against foreign competition until they become profitable.
c. the American automobile industry should be protected against Japanese firms that are able to produce automobiles at relatively low cost.
d. the French government's subsidies to French farmers justify restrictions on American imports of French agricultural products.

d