A Recessionary Gap Is Usually Closed in the Long Run

Multiple Choice

A recessionary gap is usually closed in the long run by a(n) :

A) rightward shift of the short-run aggregate supply curve.
B) leftward shift of the short-run aggregate supply curve.
C) rightward movement along a fixed short-run aggregate supply curve.
D) decrease in aggregate demand.
E) leftward movement along a fixed short-run aggregate supply curve.