Based on the description of the Mound Builders, they primarily lived in regions that are from the Great Lakes to the Gulf of Mexico and east of the Mississippi River to the Appalachian Mountains. Therefore, the correct regions from the map would likely be:
- Region A (if it corresponds to the area mentioned)
- Region B (if it corresponds to the area mentioned)
Please match these selections with the specific regions on your map to confirm they align with the Mound Builders' historical areas.