David Ricardo Would Be MOST Likely to Agree with Which

David Ricardo would be MOST likely to agree with which statement?

A) High tariffs on grain are needed to protect the living standards of farmers.
B) Free trade benefits both trading countries.
C) If you have an absolute advantage in producing both trousers and beer, you should not trade with other countries.
D) If you have a comparative advantage in producing both trousers and beer, you should not trade with other countries.