Suppose Government Does NOT Intervene in the Economy

Multiple Choice

Suppose government does NOT intervene in the economy.How would an expansionary gap be closed in the long run?  

A)  by a rightward shift of the short-run aggregate supply curve 
B)  by a leftward shift of the short-run aggregate supply curve 
C)  by a movement to the right along a fixed short-run aggregate supply curve 
D)  by a movement to the left along a fixed short-run aggregate supply curve