The Sultan who was also known as ‘Lakh Baksh’ is: 

Correct option is C

• Qutbuddin Aibak, the founder of the Delhi Sultanate, was famously known as 'Lakh Baksh', which means "giver of lakhs" (a reference to his generosity).
• He earned this title because of his generosity in distributing wealth and gifts to his subjects, especially during his reign as the Sultan of Delhi.

Additional Information:

• Qutbuddin Aibak was originally a slave of Muhammad Ghori, the ruler of the Ghurid dynasty, and later rose to power as a military commander. After the death of Muhammad Ghori, Aibak declared himself the Sultan of Delhi in 1206.
• He is also known for his contributions to architecture, most notably starting the construction of the Qutb Minar in Delhi, which is a UNESCO World Heritage Site.

Other Options:

•   Muhammad bin Tughlaq : He was a Sultan of the Delhi Sultanate known for his ambitious but often failed policies. He was not known by the title 'Lakh Baksh'.
•  Iltutmish : Hewas a prominent ruler of the Delhi Sultanate and the father of Raziya Sultana. He is known for consolidating and strengthening the Delhi Sultanate but was not referred to as 'Lakh Baksh'.
• Ghiyasuddin Tughlaq : He was the founder of the Tughlaq dynasty. He is not known by the title 'Lakh Baksh'.