Final answer:
The Bantu languages spread during the migration across Africa through the movement of the Bantu people.
Step-by-step explanation:
The Bantu languages spread during the migration across Africa. The Bantu people, who spoke the Bantu languages, gradually migrated eastwards and southwards, carrying their languages with them. As they moved, they interacted with other indigenous groups, influencing their languages and cultures. This process of language diffusion led to the spread and diversification of the Bantu languages across the African continent.
Learn more about Spread of Bantu languages