How was the southeast native americans organized?

The Southeast culture area stretches from the Atlantic Ocean westward to the arid lands beyond the Trinity River in present-day Texas, and from the Gulf of Mexico northward to varying latitudes in the present-day states of Texas, Oklahoma, Arkansas, Missouri, Kentucky, West Virginia, Maryland, Virginia and North Carolina.
The majority of Native Americans in the Southeast made their homes along river valleys in villages which served as the dominant form of social organization. In general, it can be said that the people of the Southeast were farmers first and hunters, gatherers, and fishermen second.
The larger tribes of the area include the Cherokee, Choctaw, Chickasaw, Creek and Seminole (an offshoot of Creek), referred to by whites as the Five Civilized Tribes.

The correct answer is c