Explanation: Sub-Saharan African states relied largely on trade with Europe to purchase guns necessary to capture other slaves and expand their own state structures. Eliminate (C), as Europeans were not the only buyers of slaves. Eliminate (D) because it refers to Ethiopia specifically and not the whole of Sub-Saharan Africa. Eliminate (A) because it implies that New World foods were constantly shuttled into Africa to feed the population of the continent; while New World foods were brought into Africa, after the initial contact, Africans grew New World foods in Africa itself. Therefore, (B) is correct.