How would I go about solving this problem ?

multiple answer. Based on what we know about the process of deposit creation throughout the banking system, which of the following would be sure to cause the money multiplier to increase? [:] The central bank conducts an open-market sale of securities. C] The central bank increases the required reserve ratio in an economy in which banks never hold any excess reserves C] Banks become more optimistic about the economy, and begin to reduce their excess reserves by making more loans. C] The central bank reduces the required reserve ratio in an economy in which banks never hold any excess reserves. C] Households decide to hold more of their savings as currency, and less as bank deposits