Answer:
B. mining industry
Step-by-step explanation:
A large number of the people live in the central African countries and most of them live b side of the lake chad. Since the prehistoric times, they have been the places of the iron smeltings going back to the period of 100,000 years.
The main economic activity of the lands is the farming and the fishing and the herding and demographically the central Africa is inhabited by the Bantu people. The skilled people use the bronze and the iron and the copper that hey made form the terracotta structures.