Final answer:
The fire damaging the Coliseum was caused by lightning and an angry mob.
Explanation:
The fire that damaged the upper levels of the Coliseum was caused by:
- a. A bolt of lightning: Accidental fires from lightning strikes have historically caused damage to structures.
- d. An angry mob: Riots and unrest have led to fires in historical events, like the burning of buildings during insurrections.
Learn more about Coliseum Fire Cause here:
https://brainly.com/question/40648692