Because the Sioux Are the Most Numerous of the Native

Because the Sioux are the most numerous of the Native American tribes

A) this means nothing, as each Native American tribal unit is different from the others.
B) they serve as the prototype for substance abuse rehabilitation programs for working with the Native Americans.
C) they tend to dominate planning for treatment allocation resources for substance abuse rehabilitation programs.
D) they tend to have a more unified culture as compared with the other tribal units found in the United States.