If the U.S. dollar appreciates against the Canadian dollar, 

a. It costs more U.S. dollars to obtain each Canadian dollar. 

b. It costs fewer U.S. dollars to obtain each Canadian dollar.

c. It costs fewer Canadian dollars to obtain each U.S. dollar.

d. If costs more Canadian dollars to obtain each U.S. dollar.

e. a and c are correct.

f. b and d are correct.