The most important reason for the collapse of Rome was the failure to actually integrate what they conquered. When Roman soldiers conquered new lands, it was rare that they ever attempted to force their culture, ideals, or laws upon the natives and barbarians. Thus, when the Empire began suffering internal struggles, the natives they had conquered decided to take action, which lead to the swift collapse by barbarian invasion from all sides. It's hard to pick a LEAST important reason, seeing that there were many of them, but I suppose a contender would most likely be the common refusal of the Empire to even acknowledge that barbarians were rising. On the outer edges of their territory, in places like Gaul and Morocco, the Roman government was reluctant to even recognize the threat of the barbarians, thinking that even accepting that these barbarians were causing trouble would weaken their prestige in the public eye.
The answer is D
A good way to remember this is to think about America before or pre-columbus, who came to the americas in 1492.
This passage we can say is a direct response the critique of indulgences raised by the Protestant reform.
In other words this could be a direct answer to Martin Luther and his 95 thesis, in which the selling of the indulgences, that is the forgiveness of sins in exchange of money, was the main issue. The Church states that the Christ himself gave the right to them to sell the indulgences and that that is the time-honored tradition.
