The Nation of Pineland Forbids International Trade

The nation of Pineland forbids international trade.In Pineland,you can buy 1 pound of fish for 2 pounds of beef.In other countries,you can buy 1 pound of fish for 1.5 pounds of beef.These facts indicate that

A) Pineland has a comparative advantage,relative to other countries,in producing fish.
B) other countries have a comparative advantage,relative to Pineland,in producing beef.
C) the price of beef in Pineland exceeds the world price of beef.
D) if Pineland were to allow trade,it would import fish.