The Mounds Discovered at Poverty Point Tell Us What About

The mounds discovered at Poverty Point tell us what about early North American life?

A) North Americans had virtually no contact with their South American counterparts.
B) Despite their foraging lifestyle, early North Americans engaged in complex social behaviors and formed permanent settlements.
C) Farming spread rapidly from Mesoamerica to North America.
D) Early North Americans lived in highly stratified societies in which a small group of individuals held a large amount of power.