The correct answer is A. Banking regulators like Fed.
Banking regulators is a group which is being responsible to prevent bank run.
Bank run is known to occur if a big number of people withdraw their money from a bank.
The main reason which may lead to many people withdrawing money may be because in the near future they may think that the bank may stop functioning or become insolvent.
Some bank regulators may include; federal reserve board, office of thrift supervision, state bank regulators, financial industry regulators authority, and federal deposit insurance corporation.