Answer:
A. Banks must keep a specific percentage of deposits on hand.
Step-by-step explanation:
Fractional reserve banking is known to be a system whereby bank deposits of a fraction are actually backed the cash on hand which is usually available for withdrawal. In the fractional reserve banking, banks re required to keep a certain amount of deposits on hand. This deposit on hand is known as bank's reserves. actually, banks are not required to keep the entire amount on hand.
Option A is the correct answer.