Which Is Most True About the Function of a Catalyst

Which is most true about the function of a catalyst?

A) Catalysts speed up the reaction by lowering the transition state of a reaction.
B) Catalysts usually need higher temperatures to promote reactions.
C) Catalysts lower the energies of the reactants.
D) Catalysts lower the energies of the products.
E) Catalysts increase the yield of the reaction.