The graph shown below diagrams the energy involved in the

A) difference in activation energy of a reaction with and without an inhibitor at an allosteric site.
B) difference in the activation energy of a reaction with and without an enzyme.
C) activation energy needed to initiate the Embden-Meyerhof pathway.
D) difference in synthrophic reactions with and without a hydrogen utilizing partner.
E) difference in activation energy with NADH versus NADPH.