Which among the following monuments was not constructed by Qutubuddin Aibak ?
[A] Kubbat-ul-Islam mosque
[B] Qutub Minar
[C] Adhai din Ka Jhopada
[D] Alai Darwaja

Alai Darwaja
Qutub-ud-din Aibak laid the foundation of ‘Qutub Minar’ which was completed by Iltumish and constructed two Mosques : a)Kubbat-ul-Islam mosque (1195- 1199 A.D.) Near Rampithor Fort, Delhi. b)Adhai din Ka Jhopada (1208 A.D.) Ajmer. The Alai Darwaza of Delhi is located in the Qutub Complex of Delhi ,was built by Ala-Ud-Din Khilji.