Assuming That a Is Positive,theories of Short-Run Aggregate Supply Are

Assuming that a is positive,theories of short-run aggregate supply are expressed mathematically as

A) quantity of output supplied = natural rate of output + a(actual price level - expected price level) .
B) quantity of output supplied = natural rate of output + a(expected price level - actual price level) .
C) quantity of output supplied = a(actual price level -expected price level) - natural rate of output.
D) quantity of output supplied = a(expected price level - actual price level) - natural rate of output.