Because the United States Has a Flexible Exchange Rate System

Because the United States has a flexible exchange rate system, one would expect that

A) U.S. exports and imports would be in balance.
B) the U.S. current account would be in balance.
C) U.S. exports to China would be in balance with U.S. imports from China.
D) all of the above are true.
E) none of the above are true.