Answer:
It is thermal energy, which is a type of kinetic energy.
Step-by-step explanation:
The temperature of a substance is a certain measure of the vibration intensity between its atoms. For a higher temperature, the atoms of the substance will be more excited between them and will have a higher value of kinetic energy. For a lower value of temperature, the kinetic energy will be lower.
What best explains the type of energy present in the vibrating atoms of a substance is the thermal energy, which is a type of kinetic energy (in this case).