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:

speeds up the rate of a reaction .does not alter the products of the reaction .is unchanged chemically and in mass at the end of the reaction.

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.

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?  

What do you not know about it