​The first law of demand states that

A) ​the quantity demanded increases as price falls
B) the quantity demanded decreases as price falls
C) the quantity demanded increases as price increases
D) ​none of the above

The first law of demand states that as the price of a good or service goes down, the quantity demanded of that good or service increases, all else being equal. This is because consumers are more willing and able to purchase the good or service at a lower price. As the price goes up, the quantity demanded decreases because fewer consumers are willing and able to purchase the good or service at the higher price.