Which ONE of the Following Statements Is True

Which ONE of the following statements is true?

A) Equilibrium occurs at the price at which the quantity of the currency demanded exactly equals the quantity supplied.
B) Whatever causes U.S. residents to buy more or fewer foreign goods shifts the demand curve for the foreign currency.
C) Whatever causes foreigners to buy more or fewer U.S. goods shifts the supply curve for the foreign currency.
D) All of the above