How does a catalyst work?
a.
it shifts the reaction toward the products.
b.
it changes the pressure of the products.
c.
it increases the temperature of the reactants.
d.
it increases the temperature of the products.
e.
it decreases the activation energy hurdle.

E.  It decreases the activation energy hurdle.

Explanation:

A catalyst is a substance that:

A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalyzed reaction.

The effect of a catalyst on the activation energy is shown on attached image. This shows how the energy of the reactants and products change during a reaction.