Given the following question:
The question itself lets us know what the x axis represents, which is what the product sells for.
p(x) we can assume (or it says) represents the yearly profit they make off the product.
The answer is option B the amount of increase in the profit for every ten dollar increase in selling price. As the product goes up in price the amount of profit also goes up, but when the manufacturer sells the product for way too much the profit starts going down, because less people are buying the product.
Your answer is option B.