The reasons for the Bantu migration included:
- To follow herds of migrating animals
- Trade
- To find iron ore
- Depletion of resources
Each of these factors played a role in the Bantu migrations, but if you want to choose only one, "depletion of resources" is often highlighted as a primary reason for their movement. However, all the options listed can be considered potential reasons for the Bantu migrations, depending on the specific context and time.