Which of the following statements correctly describe the trade empires of Northwestern Africa ?I. The empires of Ghana, Mali and Songhai were located roughly in the same geographical area.II. All of these trading empires had control of sea trading routes and taxed goods along both land and ocean going trade routes.III. Although these empires were successive, the empire of Mali was the most wealthy as shown in the spectacular city of Timbuktu.IV. Warfare and upheavals among local tribes was common due to the fact that there was little to no resources of value in the area. a. I and II are correctb. II and III are correctc. I and III are correctd. II and IV are correct

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