One Reason the Long-Run Aggregate Supply Curve Has the Slope

Multiple Choice

One reason the long-run aggregate supply curve has the slope it does is due to the fact that:

A) if current output equals potential output, the short-run aggregate supply curve is stable.
B) that inflation is zero in the long run.
C) over long periods of time the economy moves to its potential level of output with higher inflation.
D) over long periods of time the economy moves to its potential level of output with lower inflation.