The Federal Reserve System is the central bank of the United States. It was founded by Congress in 1913 to provide the nation with a safer, more flexible, and more stable monetary and financial system. Over the years, its role in banking and the economy has expanded. It performs five general functions to promote the effective operation of the U.S. economy and, more generally, the public interest.
Because the amount paid additional to the interest is repayment of loan which is the principal amount. So the option A is only correct. The other options discusses about interest which is not the portion of the amount initially borrowed.
