Catalysts are molecules that lower the activation energy for

Catalysts are molecules that lower the activation energy for a given reaction. Cells produce their own catalysts called proteins enzymes cofactors complexes

Solution

Answer : The correct answer is B (Enzymes)

Explanation : Enzymes are the biocatalysts - the catalysts of life. A catalyst is defined as the as the substance that increases the velocity or rate of the chemical reaction without itself undergoing any change in the overall process.