Correct option is D
Ghiyasuddin Balban ruled in India between 1266 and 1287
· He was the ninth sultan of the Mamluk dynasty, and he is considered to be one of the greatest rulers of the Delhi Sultanate. He also made significant improvements to the military and the bureaucracy, and he promoted trade and commerce.
· Balban was a member of Iltutmish's famed group of 40 Turkic slaves.
· As the fundamental foundation of his autocratic administration, Balban reorganised his army and made it strong and effective.
· He appointed Imad-ul-Mulk, a capable and vigilant general, to be the army's Diwan-i-Ariz (Minister of War).