When the Fed adds new reserves to the system, some of these new reserves find their way out of the country into foreign banks or foreign investment funds. In addition, some portion of the new reserves ends up in people's pockets and under their mattresses instead of bank vaults. These "leakages" reduce the money multiplier and make it more difficult for the Fed to control the money supply because A. the money does not remain in the banking system and reserves only result in multiple expansion when they lead to additional loans. O B. public money holdings are volatile and it is difficult to predict how much the leakages will be at any given time O C. it is challenging for the Fed to accurately predict the money holdings of the public and thus difficult to know the exact affects of policy changes. O D. All of the above