Answer: D. Sahel Region
Explanation: A, B, and C would not be suitable for business and industry because A is a desert, (meaning next to nobody is around and it is way to hot) B is a lake, (you can't start a industry business in a lake, plus the water pollution would be awful) and C is a mountain (it is way too cold, you will most likely not find completely flat land, and you would have less oxygen). So, the answer would have to be the Sahel Region.