If you look closely, there all surrounding water. Whether it's large bodies such as lakes or Oceans or small such as rivers
Human migration occurred because of several factors. The reasons are the following:
1.food shortages
2.War
3 Seasonal changes
4.Disease and epidemic.
Africans are nomadic people. They thrive more from their environment. They only had to stop migrating during the agricultural era, wherein they learn to plant and tend crops and started cattle herding.
It would be D & E. They are the beginnings of a religion/mythology and a community.
