Which of the following was the source of life for the native americans

Native Americans lived like this for two main reasons: Partly because the Great Plains would not support their way of life in any one place for long, and they had to follow the buffalo migrations. Also partly because they believed that their god, the Great Spirit, wanted them to live a life of continual moving.The ancestors of living Native Americans arrived in what is now the United States at least 15,000 years ago, possibly much earlier, from Asia via Beringia.

Explanation:

any answer

answer; (c) slaves brought to the americans from africa;