"Refer to the above graphs, in which the numbers in parentheses near the AD1, AD2, and AD3 labels indicate the level of investment spending associated with each curve, respectively. All numbers are in billions of dollars. The interest rate and the level of investment spending in the economy are at point C on the investment demand curve. To achieve the long-run goal of a noninflationary full-employment output Qf in the economy, the Fed should:"
A)increase aggregate demand by increasing the interest rate
B)decrease aggregate demand by increasing the interest rate
C) increase aggreagate demand by decreasing the interest rate
D) make no changes in the interest rate
Above are the options, if you could give and answer and if time explain why its the answer briefly that would be great. thank you