Question

Yao's Asian Market sells dragon fruit for $3 each. The store usually sells 20 dragon fruits a week. Dragon fruit is in season, and the market could maintain a steady delivery. The produce manager decides to have a sale on dragon fruit and reduces the price to $2 each. Which of these would happen?
The demand would not keep up with the supply.

The supply would not keep up with the demand.

The quantity demanded would decrease.

The quantity demanded would increase.

Answer 1

The question is asking to choose among the following choices that might happen base on the situation that is stated in you question, and base on my further research and understanding about the said question,  for me, the answer would be letter D. The quantity demanded would increase. I hope this would help 

Answer 2

I believe the answer is: The quantity demanded would increase.

As the price of a product goes down, more customers would be able to bought the product, which would increase the quantity demanded .
This law of economic only applicable to elastic goods (non-essentials) such as fruits, electronics, vehicles, etc. For essential goods, the change in price wouldn't necessarily affected the demand.