If an electron is moved a certain distance directly opposite an external electric field, what can we say about the change in the electric potential energy of the system?

There would be a decrease in  electric potential energy of the system.

Explanation:

the answer is to check all of them! they all apply well at least i think so!

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force