One of the Reasons the British Pound Depreciated Against the U.S

One of the reasons the British pound depreciated against the U.S. dollar during the late 1970s is that

A) British productivity growth was greater than U.S. productivity growth.
B) the U.S. inflation rate was greater than the British inflation rate.
C) the British inflation rate was greater than the U.S. inflation rate.
D) U.S. consumers increased their preference for British goods.