The correct answer is A: The Mississippian people lived in a region with a wet climate, whereas the Ancestral Puebloans lived in a dry climate.
The Ancestral Puebloans were located in southeastern Utah, northeastern Arizona, northwestern New Mexico, and southwestern Colorado, which are the American southwest desert regions, their land and climate was dry and hot.
As for the Mississippian people, they lived mainly in the Southeast, usually in the river valleys of Mississippi, and in other states named now as Alabama, Georgia, Arkansas, Missouri, Kentucky, Illinois, Indiana, and Ohio; at the time the tribe existed, the climate of this regions was wet and warm.