The Long-Run Aggregate Supply Curve Is Vertical Because

Multiple Choice

The long-run aggregate supply curve is vertical because

A) in the short run, prices are flexible but output is equal to potential output.
B) in the long run, prices are flexible but output is equal to potential output.
C) in the short run, prices are fixed but output may be above, below, or equal to potential output.
D) in the long run, prices are fixed and output is equal to potential output.