Answer: A. They modify the equilibrium of the reaction
Step-by-step explanation:
Catalysts like Maltase work to increase the reaction time during a reaction and they do this by lowering the activation energy required by the reactants.
Catalysts are recyclable and are not to be used up in the reaction but are merely there to speed it up.
The only option that does not show the purpose of a catalyst is therefore that they modify the equilibrium. Catalysts are not to modify the equilibrium of the reaction as they are neither reactants nor products.