Which tool is used to control money supply in banking in economy?a.Repo Rate b.Bank Rate c.Reverse Repo Rate. d.none

The tool primarily used to control the money supply in the banking system and the economy is the **Repo Rate** (option a). The repo rate is the rate at which the central bank lends money to commercial banks, and it influences the overall money supply in the economy. By adjusting the repo rate, the central bank can either increase or decrease the amount of money available in the banking system. The **Bank Rate** and **Reverse Repo Rate** are also important tools but serve slightly different purposes. The bank rate is the rate at which the central bank lends money to commercial banks without any security, while the reverse repo rate is used to absorb liquidity from the banks by allowing them to park their excess funds with the central bank. So, the correct answer is **a. Repo Rate**.