The correct statement reflecting the Kinetic Molecular Theory is: The temperature of a substance is a measure of the average kinetic energy of its particles.
Kinetic Molecular Theory explains that matter is made up of small particles that are in constant motion, and the temperature of a substance relates to the average kinetic energy of those particles. The theory also indicates that the distance between particles varies among solids, liquids, and gases, with gases having the most space between particles and solids having the least.