If the Fed Buys Government Securities from Commercial Banks in the Open

If the Fed buys government securities from commercial banks in the open market,

A) the Fed gives the securities to the commercial banks and increases the banks' reserves.
B) the Fed gives the securities to the commercial banks and decreases the banks' reserves.
C) commercial banks give the securities to the Fed, and the Fed increases the banks' reserves.
D) commercial banks give the securities to the Fed, and the Fed decreases the banks' reserves.