To Achieve the Gains from Trade, Each Nation Should Specialize

To achieve the gains from trade, each nation should specialize in the production of a good or service if:
A.its production possibility frontier is larger than that of any other country.
B.its production possibility frontier is smaller than that of any other country.
C.the country can make the product using fewer resources than any other country.
D.the country can make the product while forgoing fewer alternative products than any other country.