According to Empirical Studies, the Gains from International Trade

According to empirical studies, the gains from international trade:

A) are equal to more than 10 percent of GDP per year in all countries.
B) are not large enough to be of any concern to policy makers interested in increasing human welfare.
C) are large only in very small countries, but negative in large countries like the United States.
D) are equal to several hundred billion dollars per year throughout the world.