The purpose of the demand curve is to allow a firm to examine prices in terms of quantity sold.
The Demand curve shows the price at which various quantities of goods and services are bought and sold in the market.
A firm can therefore use a demand curve to see which prices they can sell their goods and at what quantity.
In conclusion, option A is correct.
Find out more on the demand curve at https://brainly.com/question/1486483.
