Answer:
A. He created the Federal Reserve System, which allowed the government to control the flow of money in the country.
Step-by-step explanation:
The federal Reserve enable the central government to print /create the money that circulated in the country. This ability give the power to the central government to control the rate of inflation/deflation the country.
For example, If the country is experiencing inflation, the central government could reduce the amount of printed money. By doing this, the value of money circulated in the country will gradually increase and the rate of inflation be reduced.