The correct option is Khwaja Qutbuddin Bakhtiyar Kaki.
Explanation
The Qutub Minar is a UNESCO World Heritage Site and a quintessential example of early Indo-Islamic architecture in India. Construction began under Qutb-ud-din Aibak, the founder of the Mamluk (Slave) Dynasty, and was continued by his successor Iltutmish.
Historical Association:
- Khwaja Qutbuddin Bakhtiyar Kaki: The Qutub Minar was named in honor of this revered Sufi saint of the Chishti Order. Qutb-ud-din Aibak was a devotee of the saint, and the monument was dedicated to his memory. He was a contemporary of Aibak and Iltutmish and played a significant role in establishing the Chishti order in Delhi.
- Other Options:
- Hazrat Nizamuddin Auliya: A prominent Sufi saint of the Chishti order who lived during the later period of the Delhi Sultanate (associated with the Tughlaqs), long after the Qutub Minar's initial construction.
- Khwaja Moinuddin Chishti: The founder of the Chishti Order in the Indian subcontinent, whose dargah is located in Ajmer. He was the spiritual master of Bakhtiyar Kaki.
- Shah Waliullah: An Islamic scholar and reformer from the 18th century, historically unrelated to the construction of the Qutub Minar.
Key Takeaway:
Although commissioned by Qutb-ud-din Aibak, the Qutub Minar derives its name from the Sufi saint Khwaja Qutbuddin Bakhtiyar Kaki, not the Sultan himself.