Answer:
The correct answer is letter "D": demand for apples will necessarily decrease.
Explanation:
According to the demand law, if the price of a good or service decreases the quantity demanded will increase. In case the price of the products increase, the quantity demanded will decrease. The relationship between quantity demanded and the price is inversely proportional.
Thus, if the price of the fertilizers increases, the price of apples will increase. If the price of apples increases, the quantity demanded for apples decreases.