Each of the Following Is Part of the Economy's Stock

Each of the following is part of the economy's stock of money except

A) coin and currency that are transferred by handing the cash over to the seller.
B) credit cards held by the private sector.
C) checking account balances that are transferred by electronic debit or by writing a check.
D) other assets, like savings account balances, that can be turned into cash or demand deposits nearly . instantaneously, risklessly, and costlessly.