A. To remind citizens of their constitutional rights.
Brainliest?
Answer: Petroleum.
Reason: Petroleum could be turned into kerosene which was used in stoves and lamps.
I think it was <span> over who would control appointments of church officials, a conflict which is sometimes called the Investiture Controversy. Hope this was useful :P</span>
Barbarian attacks caused the collapse of the Western Roman Empire.
