Which of the following best describes the purpose of the federal reserve bank?

a. the federal reserve bank manages the u. s. economy by controlling the money supply.
b. the federal reserve insures deposits to make sure customers don't lose money if their bank fails.
c. the federal reserve regulates economic activity to prevent the demand for withdrawals from rising above 10 percent.
d. the federal reserve assures a free-market system by preventing unnecessary government regulations.