Answer:
The best answer to the question: During the decline of the Roman Empire, the Roman emperors usually died by being killed in battle or being killed:___ would be, D: by their own soldiers.
Step-by-step explanation:
History has shown that the power of Rome came from its military forces, more than any other factor. While the army itself lived outside of the city´s walls and was entrusted with controlling the annexed and invaded territories of the Empire, there was another military force, that was much closer to the Emperor and whose power was enormous. This force was known as the Praetorian Guard. In fact, many historians say that the true power of Rome lay in the hands of the Praetorians and their Captain. Throughout the Roman history of the Empire, but mostly towards its decline aroun 476, there were a lot of cases in which the end of the Emperor was brought on by none other than his Praetorians, meaning, his own guard. This is why the answer is D.