All Else Being Equal,if the Rate of Growth in Productivity

All else being equal,if the rate of growth in productivity in Spain is greater than the rate of growth in productivity in the United States,the euro

A) will decrease in value relative the U.S.dollar.
B) will increase in value relative to the U.S.dollar.
C) will nominally appreciate against the dollar,but its real value relative to the dollar will remain unchanged.
D) will nominally depreciate against the dollar,but its real value relative to the dollar will remain unchanged.