Suppose the United States Produces Only Two Goods, Grapes and Tractors

Suppose the United States produces only two goods, grapes and tractors. If the United States has a comparative advantage in tractors, a move toward free trade will:

A) benefit tractor workers, harm grape workers, but harm the nation as a whole.
B) harm tractor workers, benefit grape workers, but benefit the nation as a whole.
C) benefit tractor workers, harm grape workers, but benefit the nation as a whole.
D) harm tractor workers, harm grape workers, but benefit the nation as a whole.