A traditional black house with a thatched cottage.

More than 90% of sub-Saharan Africa is black, which is the hometown of black people in the world. Most of sub-Saharan Africa is located in the tropics and has a vast grassland area. In order to adapt to the local hot climate, local traditional houses are thatched huts, and thick thatched huts can insulate heat. Cave dwellings are traditional dwellings on the Loess Plateau, stilts are dwellings in hot and humid areas, and igloos are traditional dwellings of Inuit people.

So choose: C.