Which of the Following Is Not an Important Question That

Multiple Choice

Which of the following is not an important question that macroeconomic models help clarify?

A) Can governments reduce the severity of their economies' recessions?
B) Is a policy of manipulating interest rates more effective at mitigating short-run economic fluctuations than a policy of changing the tax rates?
C) How will OPEC manipulate and maintain the price of crude oil in the world markets?
D) Is there a trade-off between lower unemployment and lower inflation?