A medium of exchange is:
A. a measure by which prices are expressed
B. an asset that is used to settle future debts
C. the thing traded when barter takes place.
D: an object that sellers will accept as payment

Reserves are __________.
A. gold in a bank's vault plus its gold at federal reserve banks
B. cash in a bank's vault plus its its gold at federal reserve banks
C. cash in a bank's vault plus the cash carries by its customers
D. cash in a bank's vault plus its deposits at federal reserve banks.