I do not have your choices of "the following" Here are some reasons I learned: Christianity, empire was too big and became hard to manage, there were many nonromans attacking parts of empire- Goths, the emperors themselves were weak or insane intrigue was rampant.
he was an american founding father who took part in writing the declaration of independence and he was the 3rd president of the US, hope this helps
The answer to the question would be A
