The Bank of Canada Sells a Canadian Government Security and a Bank

The Bank of Canada sells a Canadian government security and a bank dealer writes a cheque for the amount.When the cheque clears,

A) reserves remain unchanged because the decrease of reserves at the dealer's bank are offset by an increase in the reserves at the Bank of Canada.
B) reserves have fallen by the amount of the cheque because the Bank of Canada clears the cheque by reducing the bank's deposits at the Bank of Canada.
C) reserves increase by the amount of the cheque because the Bank of Canada clears the cheque by increasing the amount of the bank's deposits with the Bank of Canada.
D) reserves have fallen by the amount of the reserves times the desired reserve ratio,and the money supply falls by the difference between the amount of the cheque and the fall in the reserves.