Concept:Qutubuddin Aybak was the first Sultan of the Delhi Sultanate. His reign began after the death of Muhammad Ghori in 1206 and ended with his own death in 1210. Explanation:Qutubuddin Aybak served as a general under Muhammad Ghori. After Ghori’s assassination in 1206, Aybak declared independence in Lahore. He ruled for only four years. His reign is known for consolidating Muslim rule in North India. He died in 1210 due to a fall from his horse while playing polo. Hence, his reign is from 1206 to 1210.Answer:C. 1206−1210