Concept:El Hadj Umar Tall was a 19th-century Islamic reformer who led a jihad in West Africa.Explanation:He belonged to the Tijaniyyah Sufi order and launched a religious conquest from Futa Toro.His forces conquered the Bambara kingdoms and established the Tukulor Empire.The empire's capital was at Segou, which lies in present-day Mali.Therefore, his movement aimed to build an Islamic state in Mali.Answer:B. Mali