What Would Be the Effect on Short-Run Aggregate Supply of a Large,permanent

Multiple Choice

What would be the effect on short-run aggregate supply of a large,permanent reduction in the world supply of oil?

A) It would shift left (an increase in short-run aggregate supply) .
B) It would shift left (a decrease in short-run aggregate supply) .
C) It would shift right (a decrease in short-run aggregate supply) .
D) It would shift right (an increase in short-run aggregate supply) .