A Nation Can Gain from International Trade When

A nation can gain from international trade when

A) its relative production costs are the same as those of other countries.
B) it exports goods for which it is a low-opportunity cost producer while importing goods that it could produce only at a high opportunity cost.
C) it imports goods for which it is a low-opportunity cost producer and exports goods for which it is a high opportunity cost producer.
D) it has a trade deficit.