What are special proteins that catalyze (speed up) chemical reactions?

A. Neutrons

B. Carbons

C. Enzymes

D. Electrons

The enzymes are the special types of proteins which decreases the activation energy of the chemical reaction. The activation energy is the minimum amount of energy required to start a chemical reaction. Hence the enzymes are the special type of proteins that catalyses or speed up the chemical reaction by decreasing the activation energy of the reaction. Hence the correct answer is option C. Enzymes.