According to new Keynesian sticky-price theory, if policymakers act quickly enough in enacting expansionary policies in response to a decrease in aggregate demand, A. real GDP will return to its orignal level and the price level will fall in the long run. B. real GDP and the price level will both fall in the long run. C. real GDP and the price level will return to their original levels in the long run. D. real GDP will fall and the price level will return to its original level in the long run