Explanation:

- Medium of Exchange:

- Money allows people to buy and sell goods and services.

- It eliminates the need for barter by acting as an intermediary.

- Measure of Value:

- Money provides a standard unit for comparing the value of goods and services.

- It simplifies transactions by quantifying worth.

- Store of Value:

- Money can be saved and retrieved in the future with stable value.

- It preserves purchasing power over time.

Option 4: All the above

- Money fulfills all these roles, making it an essential part of the economy.