问题详情

If the Federal Reserve were to adopt the goal of a constant money supply, it could achieve this goal by______.
A．taking the discount rate as the appropriate target for the federal funds rate
B．buying Treasury bills when the interest rate falls and selling them with it rises
C．forbidding banks to hold excess reserves
D．using any or all of its policy tools to offset changes induced by the behavior. of banks and their depositors请帮忙给出正确答案和分析，谢谢！