Correct Answer: (4) Qutbuddin Aibak
Solution:Qutb ud Din Aibak, founder of the Delhi Sultanate, started construction of the Qutb Minar's first storey around 1192 in Mehrauli, Delhi. In 1220, Aibak's successor and son-in-law Sham suddin Iltutmish completed a further three storeys. In 1369, a lightning strike destroyed the top storey. Firoz Shah Tughlaq replaced the damaged storey, and added one more. Sher Shah Suri also added an entrance to this tower while he was ruling and Humayun was in exile.