Which one of the following is part of our money supply?

A) Gold
B) A credit card
C) NOW accounts
D) A personal check

NOW Accounts

Negotiable Order of Withdrawal accounts; interest-earning deposit accounts from which holders can write checks.

Money Supply

The inclusive amount of economic monetary assets present at a particular instance in an economy.

Credit Card

A payment card issued to users as a method of payment, allowing the cardholder to pay for goods and services based on the cardholder's promise to pay for them.