Concept:The question asks for the person who invited the Almoravid (al-Murabitun) spiritual leader to West Africa.Explanation:Yahya ibn Ibrahim, a chief of the Sanhaja Berbers, performed the pilgrimage to Makkah.There he met the scholar Abdullah ibn Yasin.Yahya ibn Ibrahim persuaded Abdullah ibn Yasin to return with him to West Africa.Abdullah ibn Yasin later became the leader of the al-Murabitun movement.Therefore, the one who brought the leader of al-Murabitun to West Africa was Yahya ibn Ibrahim.Answer:A. Yahya b. Ibrahim