The Mandans built their houses close together in o...

A

- Hướng dẫn giải

Phương pháp giải:

Giải chi tiết:

Đáp án là A. Ý trong bài: They had large villages of houses built close together. The tight arrangement enabled the Mandans to protect themselves more easily from the attacks of others who might seek to obtain some of the food these highly capable farmers stored from one year to the next.