study the image. a graph showing energy taken in and released for two chemical reactions over time. in a reaction with no enzyme, the energy of the reaction rises somewhat to form the activated complex before dropping to form the products. with an enzyme, the peak of the activated complex is significantly lower, though the energy of the products and the reactants remain the same. which answer choice correctly describes the labeled graph? (select all that apply.)

a. the activation energy is much lower with an enzyme present.
b. the activation energy is much higher without an enzyme present.
c. the activation energy is much higher with an enzyme present.
d. the activation energy is much lower without an enzyme present.