The Existence of Real Business Cycle Theory Is a Call

The existence of real business cycle theory is a call for all economists

A) to spend more time thinking about the determinants of consumption spending fluctuations.
B) to spend more time thinking about the determinants of monetary policy fluctuations.
C) to spend more time thinking about the determinants of international trade fluctuations.
D) to spend more time thinking about the determinants of investment spending fluctuations.