If the Costs of Production Decrease,there Is

Multiple Choice

If the costs of production decrease,there is

A) an increase in the quantity of real GDP supplied and a movement up along the AS curve.
B) an increase in aggregate supply and the AS curve shifts rightward.
C) a decrease in the quantity of real GDP supplied and a movement down along the AS curve.
D) an increase in aggregate supply and the AS curve shifts leftward.
E) a decrease in aggregate supply and the AS curve shifts leftward.