The correct answer is: D. Firoz Tughlaq
Qutub Minar is a minaret that forms part of the Qutb complex in the Mehrauli area of Delhi, India. It is 72.5 meters (238 feet) tall and is one of the tallest brick minaret in the world. The Qutub Minar was built by Qutb-ud-din Aibak, the founder of the Delhi Sultanate, in 1193. It was later extended by his successor, Iltutmish. The Qutub Minar was damaged by lightning in 1368 and was repaired by Firoz Tughlaq in 1386.
A. Balban was a Mamluk sultan of Delhi who ruled from 1266 to 1287. He was a powerful and successful ruler who restored order to the Delhi Sultanate after a period of instability. Balban did not build the Qutub Minar.
B. Alauddin Khalji was a Mamluk sultan of Delhi who ruled from 1296 to 1316. He was a powerful and successful ruler who expanded the Delhi Sultanate to its greatest extent. Alauddin Khalji did not build the Qutub Minar.
C. Sikandar Lodi was a Lodhi sultan of Delhi who ruled from 1489 to 1517. He was a powerful and successful ruler who restored order to the Delhi Sultanate after a period of instability. Sikandar Lodi did not build the Qutub Minar.
D. Firoz Tughlaq was a Tughlaq sultan of Delhi who ruled from 1351 to 1388. He was a powerful and successful ruler who expanded the Delhi Sultanate and built many monuments, including the Qutub Minar. Firoz Tughlaq repaired the Qutub Minar in 1386.