Indian tribes had reservations with defined borders. These borders were
able to be changed at any time, but they were still defined nonetheless.
These reservations were usually much smaller than the area in which the
tribes used to live, answer (A).
If you are asking if the statement is true, then it is. Odoacer, whose father was a commander in Attila the Hun's army, sent a message to Constantinople after Romulus Augustulus was deposed that the Roman empire needed only one Emperor. He then proclaimed himself as Italy's representative. Odoacer felt that he reunited the Roman Empire and he became the last Western Roman empire's ruler.
C. first battle in which American Indians fought outside of the Indian Territory