Consider the Nature of Macroeconomic Equilibrium

Consider the nature of macroeconomic equilibrium. If, at a particular price level, aggregate output demanded is less than that supplied by producers, then

A) the aggregate demand curve will shift to the right, re- establishing an equilibrium.
B) the price level will decline toward its equilibrium value.
C) the aggregate supply curve will shift to the left, re- establishing an equilibrium.
D) the aggregate supply curve will shift to the right, re- establishing an equilibrium.
E) the price level will rise toward its equilibrium value.