Answer:
The correct answer D
Step-by-step explanation:
When the price of the product is $9,99, then the customer bought 3 books per month. But when the price decreases from $9.99 to $7.99, then the customer bought 4 books per month. Because when the price of the product decreases, the quantity demanded for the product increases for the while and when the prices increases, the quantity demanded decreases, it is not constant.
Therefore, Jason is in correct as the demand for the product has not increases, but only the quantity demanded has increased.