Answer:
B. The Bantu learned new technology as they migrated.
Explanation:
The Bantu learned new technology as they migrated to South Africa from the people that are living there due to interaction with other tribes of South Africa. They know the knowledge of cultivation of crops and the main reason of their migration to South Africa is to search a fertile land where they can do agriculture and feed the people of their tribe so interaction enable them to learn new technology.
Should seem pretty obvious but the traders gained goods from their trade which is a benefit and slaves being slaves, suffered.
Plains Indians started hunting buffalo more efficiently.
The answer is D. :)
