Explanation:

- Option 1: Government of the country

- The government influences money supply through fiscal policies, taxation, and printing currency via the central bank.

- Option 2: Banking system of the country

- Banks create money by lending more than they receive in deposits, a process known as the fractional reserve system.

- Option 3: Both (a) and (b)

- Both the government and banking system play roles in controlling and supplying money, making this a comprehensive option.

- Option 4: None of these

- This option is incorrect as both the government and banks are key suppliers of money.