Answer:
d. Central Bank; safety and stability of the banking system.
Step-by-step explanation:
The central bank is the institution that handles the currency, the money supply and controls the banking system. This institution controls the quantity of money in the economy because it is in charge of printing the currency of the country and can put money in the market when there is not enough cash and can put it out when there is excess. Also, it is the lender of last resort for the commercial banks and sets the interest rates with the goal of having a low inflation. Through all of this, the central bank helps maintain the stability of the system.