The two letters best support which of the following conclusions?

(A) Diplomatic relations between Portugal and Kongo were often cordial. (B) Kongolese noblemen were frequently taken as slaves by the Portuguese. (C) Trade between Portugal and Kongo was highly regulated. (D) Trade between Portugal and Kongo was brisk with both parties.Explanation: Both sources indicate that trade between Portugal and Kongo happened frequently, either to the Kongolese people’s misfortune or for the acquisition of raw materials. Choice (A) is not justifiable based on the text of Source 2, since it advocates extorting resources from the Kongolese; eliminate (A). Only Source 1 supports (B), so eliminate this choice as well. Choice (C) is not supported by the passages, so eliminate (C). You are exam_ins with (D), which is the answer.