What contributed to the beginning of the decline of the Roman empire?

Choose all answers that are correct.

A. Regardless of the strings the emperors, the Roman army was on able to hold back barbarian invasions from the south and west.

B. Soldiers in the outer parts of the Roman empire often supported local commanders instead of the emperor.

C. Incompetent rulers placed huge tax burdens on the Roman citizens.

D. The soldiers hired on the front tears were not willing to go to find other parts of the empire.