Archaeologists at Poverty Point found soapstone from the southern Appalachian Mountains and copper objects from the Great Lakes area. What do these discoveries tell us about the people who built and lived at Poverty Point?

A. They made a lot of their tools and pottery from local resources

B. They depended on the Mississippi river for food

C. They used objects to help them worship in religious ceremonies

D. They traded with other groups of people that lived far away​