Answer:
A. Regular demand and supply describe the market for a single good, while aggregate demand and aggregate supply describe the combined market for all final goods and services
Step-by-step explanation:
Aggregate demand measures the total demand for all finished goods and services produced in a country.
Aggregate supply is the sum of all goods and services firms are willing to supply at a given price
Demand is the amount of a good consumers is willing and able to buy at a particular price
Supply is the amount of a particular good suppliers is willing to sell at a particular price.