All of the power because they had come to belive them as gods blah blah blah ETC.
A is the answer that you want
The reason for this is that Romans were at the time a very highly developed civilization while the Huns, together with other tribes with which the Romans have dealt with in previous decades, were mostly nomads who did not have permament and grand settlements such as Rome at the time for example. For that reason, this might have made historians like Ammianus be inclined to think that Huns were savage brutes without the capability to think.