If the United States Produces Only Corn and Mexico Produces

If the United States produces only corn and Mexico produces only oil, the price of oil, in terms of bushels of corn,

A) can be no higher than the opportunity cost of oil in the United States
B) must be higher than the opportunity cost of oil in the United States
C) can be no higher than the opportunity cost of corn in the United States
D) can be no lower than the opportunity cost of oil in Mexico
E) must be higher than the opportunity cost of oil in Mexico