Read the following paragraph from the introduction [paragraphs 1-4]. Energy cannot be created or destroyed, meaning that the total amount of energy in the universe has always been and will always be constant. However, this does not mean energy is unchangeable. It can change form and even transfer between objects. Which answer choice BEST supports the idea that energy remains constant during an energy transformation? (A) They move faster and spread out, creating a lower density of molecules, or quantity of molecules in that volume, at the bottom of the pot. (B) The process repeats, creating a current of molecules sinking, heating up, rising, cooling down and sinking again. (C) The ball continues losing potential energy and gaining kinetic energy until it reaches the bottom of the hill. (D) On Earth, however, the ball stops at the bottom of the hill due to the kinetic energy being transformed into heat by the opposing force of friction.