Correct Answer: (b) Najib Khan
Solution:Ahmad Shah Abdali entered Delhi in January 1757 and looted Delhi, Mathura, and Agra. Before returning to his motherland, he appointed Alamgir-Il as the Emperor, Imadulmulk as Prime Minister and Rohilla leader, Najib-ud-Daula (Najb Khan) as his chief agent and Mir Bakshi of the empire.