A supply function is a model that represents the behavior of the producers and/or sellers in a market. It represents how much of a good or service a producer/supplier will supply at a price of the product and other factors. Hope this answers the question.
Option A would be disruptive. Option B may would likely not help and may also be disruptive. Option D would likely not work because he can't get through not understanding. The answer would be Option C.
