What would have most likely driven members of the bantu migration from west africa to the east and south of the continent?

ANSWER:

The need for more fertile land would have driven members of Bantu from West Africa to the east and south of the continent.

EXPLANATION:

The initial homeland of Bantu people is eastern part of the Western Africa. Due to population growth, need for food increased. Bantu started to migrate to the places having vast cultivable and grazing lands. The 'Bantu migration' was directed towards the southern and eastern region where most of the 'Savannas' are located. The savannas had fertile land for agriculture, enough pasture for livestock and animals for hunting if needed. This was right environment for Bantu to migrate.

I'm pretty sure it's c. extremely gradual but not 100% sure though.

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen