Consider the following: Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid. Which of the following is correct?

ASuccinate dehydrogenase is the enzyme, and fumarate is the substrate.

BSuccinate dehydrogenase is the enzyme, and malonic acid is the substrate.

CSuccinate is the substrate, and fumarate is the product.

DFumarate is the product, and malonic acid is a noncompetitive inhibitor.

EMalonic acid is the product, and fumarate is a competitive inhibitor.