The Fed's purchase of Treasury bills leads to "multiple deposit expansion" because: A. the purchase raises the amount of reserves at banks B. this allows the government to issue even more Treasury bills which causes the Treasury deposits at the Fed to Increase even more C. the purchase raises the interest rate investor can earn on Treasury bills, thus increasing the public s desire to hold more Treasury bills as well D. this creates a direct increase into the value of the deposit multiplier leading to a change in the public's desire to hold currency relative to deposits