Would One Expect the Imports and Exports Between Two Countries

Would one expect the imports and exports between two countries to be approximately equal?

A) Yes;the foreign exchange rate assures that this will be the case.
B) Yes;this will always be the case unless one of the countries is treating the other unfairly.
C) No;there is no reason to expect that the purchases from and sales to any specific country will be equal because one country may not want to buy the items the other country produces at a low opportunity cost.
D) No;if they were approximately equal this would mean that neither country benefited from the trade.