Macroeconomic Models Help Clarify Important Questions Such as the Following

Multiple Choice

Macroeconomic models help clarify important questions such as the following, except:

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?