Recall Application 2, "Two Approaches to Determining the Causes of Recessions

Recall Application 2, "Two Approaches to Determining the Causes of Recessions," to answer the following questions:
-According to the application, a recession can be caused by:

A) a decrease in aggregate demand or an increase in aggregate supply.
B) a decrease in ether aggregate demand or aggregate supply.
C) an increase in aggregate demand or a decrease in aggregate supply.
D) an increase in either aggregate demand or aggregate supply.