Suppose the Fed Changes the Interest Rate in an Attempt

Multiple Choice

Suppose the Fed changes the interest rate in an attempt to raise planned investment.But in spite of this,planned investment remains unchanged.The most likely explanation is that

A) we have moved downward along an unchanged rate-of-return line.
B) we have moved upward along an unchanged rate-of-return line.
C) the rate-of-return line has shifted to the left.
D) the rate-of-return line has shifted to the right.