Competitive Inhibition of Enzymes Occurs

Competitive inhibition of enzymes occurs

A) when a substance binds to an enzyme at a site away from the active site.
B) when the product, instead of the reactant of a reaction binds to the active site.
C) when a substance other than the substrate binds at the active site of an enzyme.
D) when the product, or other substances, instead of the reactant, bind to the active site of the enzyme.
E) by blocking the production of an enzyme.