Final answer:
The Kinetic Molecular Theory best explains the relationships among the phases, energy, and mobility of matter.
Step-by-step explanation:
The most accurate explanation for the relationships among the phases, energy, and mobility of matter is a) Kinetic Molecular Theory. The Kinetic Molecular Theory states that matter is composed of tiny particles that are always in motion. It explains why matter exists in different phases and how matter can change from one phase to another. According to this theory, particles have a certain amount of energy that allows them to move at different speeds depending on temperature.