Answer: Option A. "Substrate(s) bind in the active site.
Explanation:
Enzymes can be defined as biological catalysts, that enhances the rate of chemical or biochemical reaction.
Substrate binds to the enzyme on its active site and converts the substrate into a specific product.
Enzymes do not take part in the reaction but it lowers down its activation energy that accelerates the rate of reaction.
Thus, the correct answer is option A.