Refer to the below diagrams, in which the numbers in parentheses near the AD₁, AD₂, and AD₃labels indicate the level of investment spending associated with each curve. All figures are in billions. The economy is at pointYon the investment demand curve. Given these conditions, what policy should the Fed pursue to achieve a noninflationary full-employment level of real GDP (Q_f)_?

A) Increase aggregate demand from AD₃to AD₂.

B) Make no change in monetary policy.

C) Decrease the money supply from $225 to $150 billion.

D) Increase interest rates from 4 to 8 percent.