A price tag of $4 for a portable power bank is an example of money as A) a medium of exchange. B) a unit of accounting. C) a store of value. D) a time deposit.

B) a unit of accounting.

Explanation:

The four main functions of money are:

it serves as a unit of account: it provides a common measure of the value of goods and services being exchanged. it serves as a store of value: money holds its value over time, so it serves as a store of value. it serves as a medium of exchange: you can use money to purchase goods and services it serves as a standard of deferred payment: money serves as a way of valuing a debt, so you can acquire goods now and pay for them later.