to speed up the rate of reaction to reduce the loss of energy as heat to control the direction of the reaction to protect the reaction from other chemicals
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Pepsin is an enzyme that acts in the stomach for protein digestion. Which of these is most likely the main role of pepsin in this metabolic reaction?
Possibilities:
- to speed up the rate of reaction
- to reduce the loss of energy as heat
- to control the direction of the reaction
- to protect the reaction from other chemicals

to speed up the rate of reaction