The correct option is D To manage foreign currency reserves
The Reserve Bank of India (RBI) is the central bank of India and controls all banking activities. It is the sole authority to print and circulate money in India. It regulates the banking functions of all the banks in India. It serves as the banker's bank by supplying money to the banks. It also it manages the finances of the government. Moreover, it is the sole custodian of the foreign currency reserves in India.