The Concept of "Comparative Advantage" Refers to the

The concept of "comparative advantage" refers to the

A) terms of trade index.
B) gains from international trade.
C) ability of one region to produce a commodity with fewer total inputs than another region.
D) ability of one region to produce a commodity at a lower opportunity cost than another region.
E) ability of one region to produce a commodity with less labour input than another region.