Which of the Following Statements Is Correct

Multiple Choice

Which of the following statements is correct?

A) The classical aggregate AD curve can be shifted by monetary and non-monetary factors.
B) The classical AS schedule is horizontal while the Keynesian aggregate AS schedule is vertical.
C) The Keynesian AD curve only shifts in response to monetary factors.
D) The classical aggregate supply schedule slopes upward to the right while the Keynesian aggregate supply schedule is vertical.
E) none of the above are correct.