Even though you have not attached the map, I believe that the answer is the A: The Sahara Desert, since it is known that the Sahara Desert, the largest warm-weather desert in the world (and it continues to expand), has also one of the lowest population densities in the world - approximately four million people live there, in a territory as big as China. The lack of rain and the extreme temperature, together with a limited infrastructure turn this massive region into a highly uninhabited place.
