The correct option is A.
Demand means the total number of products available.
What do u mean by demand?
Demand is an economic principle referring to a consumer's desire to purchase goods and services and willingness to pay a price for a specific good or service. Holding all other factors constant, an increase in the price of a good or service will decrease the quantity demanded, and vice versa.
What are the demands and examples?
If movie ticket prices declined to $3 each, for example, demand for movies would likely rise. As long as the utility from going to the movies exceeds the $3 price, demand will rise. As soon as consumers are satisfied that they've seen enough movies, for the time being, demand for tickets will fall.
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