The Supply Curve of U

The supply curve of U.S. dollars slopes upward because as the price of the dollar increases relative to other currencies, people holding:

A) foreign currency will want to convert to dollars to purchase U.S. goods.
B) dollars will want to convert to foreign currencies to purchase U.S. goods.
C) foreign currency will want to convert to dollars to purchase foreign goods.
D) dollars will want to convert to foreign currencies to purchase foreign goods.