Which statement best describes what energy transfer diagrams show?
energy can change form, but the total amount of energy stays the same
every energy transformation results in a reduction of energy
energy transformations result in fewer types of energy
each type of energy can change into one other type of energy

Energy can change form, but the total amount of energy stays the same

Explanation:

Energy is the ability of matter to produce work in the form of movement, light, heat, among others.

In this sense, according to the Conservation of Energy principle, which is established by the  first law of thermodynamics:

"Energy is not created or destroyed, it is transformed."

In fact, energy is conserved. Therefore, Energy can change form, but the total amount of energy stays the same.