Answer:
The correct answer is A. The Bantu were experts in iron metallurgy.
Step-by-step explanation:
The Bantu are comprised of about five hundred ethnic groups from southern Africa. Iron metallurgy, the extraction of metal from ores and minerals and giving them a more pure form, allowed the Bantus to made many weapons from smelting copper and bronze. Expertise in metallurgy also provided them with a range of trade and allowed the Bantus to migrate throughout Africa.