People use money as a unit of account when they:
A. hold money to transfer purchasing power into the future.
B. use money as a measure of economic transactions.
C. use money to buy goods and services.
D. hold money to gain power and esteem.

B) use money as a measure of economic transactions.

Explanation:

The four functions of money are:

unit of account: money serves as a common denominator to determine the relative value of goods and services store of value: money is used as a store of value because it can be used to store purchasing power for future use medium of exchange: money is used to buy and sell goods and services standard of deferred payment: money can be used to lend and borrow, as well as charge interests on the loans