(Figure: Aggregate Demand and Supply) the Above Graph Depicts an Economy

(Figure: Aggregate Demand and Supply) The above graph depicts an economy originally in equilibrium at point e. Assume that the government uses expansionary fiscal policy. The movement from point a to point b is due to:

A) increased consumer spending brought about by increased government spending and/or lower taxes.
B) workers and suppliers adjusting their expectations to lower price levels.
C) workers and suppliers adjusting their expectations to higher price levels.
D) decreased consumer spending brought about by increased government spending and/or lower taxes.