Initially, the reserve ratio is 10 percent. Now banks decide they want an additional 10 percent of deposits as reserves. There are no currency drains. If the Fed buys $1 million of U.S. government securities, the money supply will

A) not change because of the excess reserves banks keep on hand.
B) increase by $1 million.
C) increase by $5 million.
D) increase by $10 million.