【单选题】The Fed uses three policy tools to manipulate the money supply: _____, which affect reserves and the monetary base; changes in _____, which affect reserves and the monetary base by influencing the qua...
A.
open market operations; discount lending; margin requirements
B.
open market operations; discount lending; reserve requirements
C.
discount lending; open market operations; margin requirements
D.
discount lending; open market operations; reserve requirements