How does an enzyme affect the rate of a reaction?

A It lowers the activation energy of the reaction, increasing the reaction rate.
B It raises the activation energy of the reaction, decreasing the reaction rate.
C It lowers the activation energy of the reaction, decreasing the reaction rate.
D It raises the activation energy of the reaction, increasing the reaction rate.

Correct Answer: Option A

Explanation:
Enzymes lower the activation energy of a reaction, increasing the reaction rate.