Use the Following Figure to Answer the Question Below

Use the following figure to answer the question below.

Rate of an enzyme-catalyzed reaction as a function of varying reactant
concentration,with the concentration of enzyme constant.
-For the enzyme-catalyzed reaction shown in the figure,which of these treatments will cause the greatest increase in the rate of the reaction,micromolar?

A) doubling the activation energy needed
B) cooling the reaction by 10°C
C) doubling the concentration of the reactants from 1.0 to 2.0 micromolar
D) tripling the concentration of the reactants from 1.0 to 3.0 micromolar
E) reducing the ΔG