Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

On June 5, the U.S. Federal Reserve (the Fed) bought $20,000,000 of U.S. Treasury securities in the open market. At the time, the reserve requirement was 15%, and all banks had zero excess reserves. What is the potential impact of the Fed's purchase on the U.S. money supply?
Option A:$133,333,333 increase.
Option B:$10,000,000 increase.
Option C:$25,000,000 decrease.

Answer: A