The correct answer is: Cherokee, Seminole, and Powhatan.
The Southeast, or the Southeastern Woodlands, is a region in which there was a very large variety of Native American Tribes. Some of them are better known, while some less. One of the most recognizable tribes from this region are the Cherokee, which occupied the central northern part of the region. The Seminole were another people living in this region, more specifically, in the northern part of what is now Florida. Another tribe that was in this region, the Powhatan, are a tribe that was right on the borderline of this cultural region, so even though they are often considered in this cultural region, there's still lot of opposition about that.