The correct answer is A. Quantity supplied is determined by production costs, and quantity demanded is determined by a desire for the product.
Demand as the amount of any product a consumer wants to buy at any price. So beyond Price, when someone wants to buy it is supposed he has a desire o necessity. So income is an important consideration.
Quantity supplied is considered to be the limit in the quantity that sellers will offer for sale at a given price. The supply price influence on quantity supplied. Supply is greater if the price is higher, but less if the supply price is lower.
