The low population density in the middle belt of West Africa resulted from all the following except

The low population density in the middle belt of West Africa resulted from all the following except "inadequacy of food in the area." The other options - unfavorable climate, absence of heavy industries in the area, and inadequate infrastructure - may have contributed to the low population density in the middle belt of West Africa, but the lack of adequate food in the area is not one of the reasons. The region is known for its fertile soils, and agriculture is a major economic activity, with crops such as millet, sorghum, and cowpeas being grown in large quantities. Therefore, it is unlikely that the area would have a low population density due to inadequate food.