If the Bank of Canada Chooses to Expand M2 by Exactly

If the Bank of Canada chooses to expand M2 by exactly $1 million, it could do so by

A) buying $1 million worth of government securities on the open market.
B) increasing reserves at the commercial banks by $1 million.
C) selling $1 million worth of government securities on the open market.
D) decreasing reserves at the commercial banks by $1 million.
E) none of the above - the Bank of Canada cannot precisely control the money supply.