Which of the Following Statements Is True of the Plains

Which of the following statements is true of the Plains Indian societies in the 1840s?

A) Most exhibited remarkable similarities to New England society, especially in terms of religion and governance.
B) They had not known warfare until white men arrived there and refused to engage in any open conflict.
C) They were largely homogeneous and devoid of any substantive differences among them, forming one nation.
D) Some were nomadic hunters who relied on the abundance of buffalo, which was threatened by the arrival of white hunters.
E) They had already become deeply rooted in Christianity during the colonial era and, thus, quickly assimilated to white settlements.