Answer:
c
Step-by-step explanation:
Reserve ratio is the percentage of deposits that is required of commercial banks to keep as reserves. The lower the ratio, the higher the increase in money supply
Money multiplier = 1 / reserve requirement
Money multiplier when reserve ratio is 10% = 1/10 = 0.1 = 10%
Money multiplier when reserve ratio is 20% =1/20 = 0.05 = 5%
there is a decrease of money multiplier from 5% to 10% when reserve ratio is increased from 10 percent to 20 percent