A Series of Enzymes Catalyze the Reactions Illustrated in the Following

Multiple Choice

A series of enzymes catalyze the reactions illustrated in the following metabolic pathway:
X → Y → Z → A.Product A binds to the enzyme that converts X to Y at a position remote from its active site.This binding of A decreases the activity of the enzyme that converts X to Y.The product A functions as which of the following in terms of its effect on the enzyme that converts X to Y?

A) a coenzyme
B) an allosteric inhibitor
C) a substrate
D) a metabolic intermediate
E) a competitive inhibitor