Final answer:
The three materials commonly used as fuel in arson fires in correctional facilities are paper, mattresses, and clothing.
Step-by-step explanation:
The three materials commonly used as fuel in arson fires in correctional facilities are paper, mattresses, and clothing.
Inmates often start fires using these materials to cause damage or create disturbance within the facility.
It is important to have proper fire safety measures in correctional facilities to prevent such incidents.