What long-term political factors led to the collapse of the Roman Empire?
A.People began to take more interest in government affairs.
B.People began to feel that government service was a burden.
C.People increased support of the army under the threat of invasion.
D.People increased support of emperors under the threat of invasion.
The best option from the list would be that "C.People increased support of the army under the threat of invasion," since this led to a diminished amount of power at the state level--leading to chaos in the border region of the empire.