The graph below shows the reaction rates of two different reactions. Which of the following statements could explain the difference in the two reactions? (Note: Reaction B is the top line, and Reaction A is the bottom line). (SC.912.L.18.1)

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A. Reaction A is catalyzed by an enzyme.
B. Reaction B is catalyzed by an enzyme.
C. Reaction A occurs at a faster rate than Reaction B.
D. Reaction A and reaction B have the same reaction rate.

A. Reaction A is catalyzed by an enzyme.