Evaluate the causes for the fall of rome in 476 ce dbq asap i need a thesis

The fall of Rome had many reasons, there were four main causes. Political, economic, social and military. Rome had constant changes in leadership and their empire was too big which fell under the political cause. Another cause was the growth of Christianity, the growth had led to a major decline of the Roman empire because they couldn't fight or cause any violence which resulted in less wars and had caused many people to die during wars when they couldn't fight back.  

answer; ///i believe its (b); ///the president will sign it or veto the check first good luck

i also think it is c