Which equation correctly represents the gravitational potential energy of a
system?

I don't really understand what you are asking but... i can try to help

The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.

Hope this helps sorry I couldn't answer it☺️

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

attach the statements so i can answer : )