Assume that the money demand function is (M/P) d = 2,200 - 200r, where r is the interest rate in percent. The money supply M is 2,000 and the price level P is2. If the price level is fixed and the Fed wants to fix the interest rate at 7 percent, it should set the money supply at:
A) 2,000.
B) 1,800.
C) 1,600.
D) 1,400.