Concept:Money is a tool that makes trade and payments easier for everyone in an economy.
Its most important, or major, function is to serve as a medium of exchange.
Explanation:As a medium of exchange, money is used to buy and sell goods and services in everyday transactions.
It replaces the barter system, where goods had to be exchanged directly for other goods.
With money, a seller can accept payment and then use that money to purchase what they need, making trade simple and efficient.
Money can also store value, but this is a secondary function rather than a major one.
Being stable in value is a desirable quality of money, while acceptance by the central bank is not a standard function.
Answer:A. medium of exchange