Option a is the correct answer. Most of the sultans of Delhi Sultanate and nobles were Turkish in origin, even though they bear different designations. The first hundred years of the Delhi Sultanate was clearly a period of Turkish supremacy, ruled by groups that regarded themselves as Turks, and heirs of a definite cultural and historical tradition. During this time they produced not only three great rulers, Iltutmish, Balban and Ala-ud-din Khalji, but also a great poet Amir Khusrau.