The graph below shows energy changes during a chemical reaction that occurs without a catalyst. What would change if the reaction was catalysed by an enzyme?

A. The initial energy level (I) would be higher, speeding up the reaction.
B. The maximum energy level (II) would be higher, speeding up the reaction.
C. The maximum energy level (II) would be lower, speeding up the reaction.
D. The final energy level (III) would be lower, speeding up the reaction.

C