The Fed can increase the money supply by:

A. Decreasing the required reserve ratio, decreasing the discount rate, and/or buying bonds
B. Decreasing the required reserve ratio, decreasing the discount rate and/or selling bonds
C. Increasing the required reserve ratio, decreasing the discount rate, and/or buying bonds
D. Increasing the required reserve ratio, decreasing the discount rate, and/or selling bonds
E. Decreasing the excess reserve ratio, increasing the discount rate, and/or buying bonds

A. Decreasing the required reserve ratio, decreasing the discount rate, and/or buying bonds