Which of the Following Statements About Modern Macroeconomic Theory Is

Multiple Choice

Which of the following statements about modern macroeconomic theory is most accurate?

A) Keynes' ideas help us understand movements in output around its long-run trend,while the Classical model is more useful in explaining the long-run trend itself.
B) The classical model helps us understand movements in output around its long-run trend,while the short-run macro model is more useful in explaining the long-run trend itself.
C) Both classical and short-run macro models help us understand movements in output around its long-run trend,but neither model is effective at explaining the long-run trend itself.
D) Neither the classical nor the short-run macro model helps us understand movements in output around its long-run trend,but both are useful in explaining the long-run trend itself.
E) Only the short-run macro model is useful in understanding movements in output around its long-run trend,and in explaining the long-run trend itself.