Solving MCQ Total Energy: Question 8 - Guide & Key

[**Mariam**]

Homework Statement

Question 8 how do we solve it?

Homework Equations

The Attempt at a Solution

I thought it was B but i don't have a key or any guide. This book was used and the answer written by the previous book user was C. Why?

 

[HallsofIvy]

"Total energy" is "potential energy plus kinetic energy" so "b" is correct. I don't know of any quantity that is the ratio of energies.