The​ short-run aggregate supply curve​ has: A. a positive slope because as the inflation rate​ increases, so does the quantity of output supplied. B. a positive slope because as the inflation rate​ increases, the quantity of output supplied decreases. C. a negative slope because as the inflation rate​ increases, so does the quantity of output supplied. D. a negative slope because as the inflation rate​ increases, the quantity of output supplied decreases.