Answer:
A
Step-by-step explanation:
B is a recounting of the order in which one emperor succeeded another and his trials in becoming the leader of Rome. There is no argument in this at all.
C: This statement is made by someone not liking the assignment. A true historian would never voice this complaint.
D: This is a question seeking a fact. Not the answer.
The correct answer is A. It states what, in the writer's opinion, was the fall of the Roman Empire.