The most likely source of Islam in Mali came from

(A) wandering Berber mystics. (B) conquering Mughal armies. (C) contact with Muslim trade caravans. (D) pilgrims to Islamic shrines in Ethiopia.Explanation: Mali was near the trans-Saharan trade routes dominated by Muslim merchants in the 1300s. Those merchants frequently exposed local African merchants to Islam. Berbers are North African tribes, but they are not associated with any religious or mystical movement (A). The Mughal empire lasted from the mid-1500s to the mid-1800s, and so is out of period. The Mughals also were located in India and never entered Africa (B). Ethiopia was one of the earliest Christian nations in Africa, and therefore was unlikely to have many Islamic shrines (D).