Which of the Following Is NOT a Reason Why,in Practice,monetary

Multiple Choice

Which of the following is NOT a reason why,in practice,monetary policy-making is much more complex than the theory would suggest?

A) The central bank's knowledge of how the real world works is imperfect.
B) The central bank's knowledge of the output gap is imprecise.
C) The central bank's knowledge of the timing of a monetary policy action on the economy is imperfect.
D) The central bank's knowledge of the magnitude of the effect of a given interest rate change on planned aggregate expenditure is imprecise.
E) The central bank's ability to change the overnight rate is limited.