Answer:
I picked C, but I also think D is possible.
Step-by-step explanation:
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This is a hard question to answer. You are looking for a reason that the Roman Empire lasted so long.
It doesn't look to me like any of the choices would be an answer. It is true that women were citizens of the Empire. However, they could not vote and they could not hold office. They had to use their wits to get things done. I wouldn't choose D.
I have the same doubts about A. While it is true, it would not hold the Empire together. It would only make sure that the lower classes would not rebel because they were hungry. The lower classes were well entertained by the Circuses.
D: Romans were very tolerant of the religious beliefs of those they conquered. This fact surprises everyone when they first hear it. D could be the expected answer, however I'm not sure enough to recommend it.
I would pick C. It may not be right, but it seems to me a voice in government is something most people strive for. They mind a whole lot more about what is done with the money paid in taxes than they do about anything else.