Which statement best explains how we know that some ancient american indian tribes fought with other tribes, long before the european settlers arrived in america?
a) historians have found newspaper reports detailing the battles that took place.
b) the american indians tribes kept written records of the battles in which they participated.
c) archaeologists have found skeletons with marks of violence, dating back to that time period.
d) the american indian tribes wrote about these conflicts in books, which are still around today.