Because Decreases in the Price Level Increase Planned Aggregate Expenditure

Multiple Choice

Because decreases in the price level increase planned aggregate expenditure and short-run equilibrium output,

A) the short-run aggregate supply line is horizontal.
B) the short-run aggregate supply line is upward-sloping.
C) the aggregate demand curve is horizontal.
D) the aggregate demand curve is downward-sloping.
E) the aggregate demand curve is upward-sloping.