Aggregate price LRAS level, P SRAS AD Y1 Y2 Y3 Real GDP Reference: Ref 17-13 If the economy is at short-run equilibrium at Y2, the best central bank policy would be: O A. a decrease in the discount rate. O B. a decrease in the required reserve ratio. O C. buying of treasury bonds in the open market. O D. selling of treasury bonds in the open market.Aggregate price LRAS level, P SRAS AD Y1 Y2 Y3 Real GDP Reference: Ref 17-13 If the economy is at short-run equilibrium at Y2, the best central bank policy would be: O A. a decrease in the discount rate. O B. a decrease in the required reserve ratio. O C. buying of treasury bonds in the open market. O D. selling of treasury bonds in the open market