When Opportunity Costs Are Identical Between Two Countries for All

When opportunity costs are identical between two countries for all goods,

A) there can be no gains from trade unless there are economies of scale in some of the products.
B) international trade will be advantageous only to the country that has an absolute advantage in the production of some commodity.
C) there will be gains from trade for both countries if one country has an absolute advantage in the production of some commodity.
D) absolute advantages will determine the gains from trade.
E) there will be absolute advantages from trade but no comparative advantages from trade.