Refer to the diagrams. Other things equal, an interest rate decrease will:

A.  shift curve A to the right and shift curve B upward.

B.  shift curve A to the left and shift curve B downward.

C.  leave curve A in place but shift curve B downward.

D.  leave curve A in place but shift curve B upward.

D.  leave curve A in place but shift curve B upward.