The correct answer is A. Iwaz.
Iwaz was the first Subedar appointed by Illtutmish in Bihar. He was a Turk and a close associate of Illtutmish. He was appointed as the Subedar of Bihar in 1229 AD. He served in this position for about 10 years. He was a capable administrator and he was able to maintain law and order in Bihar. He also built a number of mosques and madrasas in Bihar.
Balban was a Turk who served as the Sultan of Delhi from 1266 to 1287 AD. He was a powerful and ruthless ruler who was able to consolidate the Delhi Sultanate. He was also a great administrator and he was able to improve the economy of the Delhi Sultanate.
Malik Alauddin Jani was a Turk who served as the Subedar of Bengal from 1232 to 1236 AD. He was a capable administrator and he was able to maintain law and order in Bengal. He also built a number of mosques and madrasas in Bengal.
Nasiruddin Mahmud was the son of Balban and he served as the Sultan of Delhi from 1287 to 1290 AD. He was a weak and incompetent ruler and he was unable to maintain the power of the Delhi Sultanate. He was eventually overthrown by his cousin, Alauddin Khalji.