Answer: (B) 3.25%
Step-by-step explanation:
Commercial banks are meant to keep a portion of their total deposits with the Fed. This is called the Reserve requirement. Every day, these commercial banks have to meet this reserve requirement but sometimes they cannot.
When this happens they can balance their account by borrowing from other banks or member institutions of the Federal Reserve who have an excess balance on their reserve. The rate at which they can borrow from these other institutions is called the Federal Funds Rate which according to the question is 3.25%. That is therefore x.