A successful restrictive monetary policy is evidenced by a shift in the money supply curve from:

a. Sm3 to a point half way between Sm2 and Sm3, a decrease in investment from $25 billion to $22.5 billion, and a decline in aggregate demand from AD3 to AD4.

b. Sm1 to Sm2, an increase in investment from $20 billion to

$25 billion, and an increase in real GDP from Q1 to Qf .

c. Sm3 to Sm2, a decrease in investment from $25 billion to $20 billion, and a decline in the price level from P3 to P2.

d. Sm3 to Sm2, a decrease in investment from $25 billion to

$20 billion, and an increase in aggregate demand from AD2 to AD3.