Which Was True of the Native Americans of the "Middle

Which was true of the Native Americans of the "middle ground"?

A) They maintained a strong, independent role in commercial exchange with Europeans.
B) They sought to isolate themselves completely from European contact.
C) They sought economic competition between tribes rather than military confrontation.
D) They continued to war against each other rather than establish intertribal confederacies.
E) They wanted to strengthen their ties to each other in order to fight the European settlers.