Out of the provided options, the correct answer is: The Bantu brought knowledge of iron tools and weapons.
To understand why this is the correct answer, let's look at each option:
1. The statement "The Bantu demonstrated how to become hunter-gatherers" is not accurate. The Bantu were not hunter-gatherers themselves, but instead were agriculturalists who practiced farming and herding.
2. The statement "The Bantu controlled trade along the West African coastline" is also not accurate. While the Bantu did engage in trade, their trade networks were not limited to the West African coastline. They had extensive trade routes that extended across various regions of Africa.
3. The statement "The Bantu adopted the language where they settled" is partially true. As the Bantu people migrated across Africa, they interacted with and assimilated various cultures, including adopting aspects of the local languages. However, this statement does not directly address the impact of the Bantu migration on Africa's cultural landscape.
4. The statement "The Bantu brought knowledge of iron tools and weapons" is correct. One of the significant contributions of the Bantu migration was the diffusion of ironworking technology throughout Africa. The Bantu people were skilled in iron smelting and blacksmithing, and as they migrated, they spread this knowledge, which had a profound impact on African societies. The ability to produce and use iron tools and weapons revolutionized agriculture, warfare, and various aspects of daily life, leading to significant social and cultural changes across the continent.
Therefore, the correct answer to the question is that the Bantu migration changed Africa's cultural landscape by bringing knowledge of iron tools and weapons.