Concept:The Tijaniyyah is a Sufi order, but its consolidation and spread in West Africa is credited to a later leader, not its original founder.
Explanation:Shaykh Ahmad al-Tijani founded the Tijaniyyah order in North Africa.
However, the influence of the order did not spread widely until the 19th century.
Al-Hajj Umar Tal worked actively to spread and strengthen the Tijaniyyah in West Africa.
He established centres, wrote books, and led religious movements that popularised the order.
Shaykh Ahmad Labbo and Shaykh Mukhtar al-Kunti are not credited with this consolidation.
Therefore, the correct option is the one that names Al-Hajj Umar Tal.
Answer:D. Al-Hajj Umar Tal