The exchange rate between the U.S. dollar and the British pound starts at $\$ 1=£ 0.5 .$ It then changes to $\$ 1=£ 0.75$ Given this change, we would say that the U.S. dollar has LO39.3 while the British pound has
a. Depreciated; appreciated.
b. Depreciated; depreciated.
c. Appreciated; depreciated.
d. Appreciated; appreciated.