A central bank can control the money of stock by:Ⅰ. establishing reserve requirements for depository institutions Ⅱ. buying and selling government securities in the open market Ⅲ. setting the interest rate at which it will loan funds to commercial banks and other depository institutions Which of the following is FALSE（）
A. Ⅰ only.
B. Ⅱ only.
C. none.
