Answer:
c. It brings reactant molecules together.
Explanation:
Catalysts in chemical reactions works by bringing reactant molecules together thereby making the reaction proceed much faster.
A catalyst is any substance that speeds up the rate of chemical reactions. Sometimes, the activation energy of reactions are very great. This makes chemical reactions very difficult to proceed.
When a catalyst is introduced, they take the reactants and bring them close enough. This way, the activation barrier is lowered and the reaction can proceed.
