In the Dollar-Pound Market,the Equilibrium Price of the Pound Will

In the dollar-pound market,the equilibrium price of the pound will change

A) only when there is a shift of the demand curve for pounds
B) only when there is a shift of the supply curve for pounds
C) only when there are shifts of both the supply for pounds and demand for pounds curves
D) whenever there is a shift of either the supply or demand curves for pounds
E) whenever there is movement along either the supply or the demand for pounds curves