Which of the following statements about catalysts is accurate?

Explanation

Option A is correct because, in catalytic reactions, the catalyst forms intermediate complexes by reacting with the reactants. Option B is incorrect since catalysts do not initiate reactions but speed up those that already occur. Option C is false because catalysts lower the activation energy barrier but do not lower the activation energy of the molecules themselves. Option D is incorrect as catalysts are recovered chemically unchanged at the end of the reaction.