How did Sultan Qutb-ud-din Aibak die?

1. The question asks how Sultan Qutb-ud-din Aibak died. 2. Qutb-ud-din Aibak was the founder of the Mamluk dynasty (Slave dynasty) and the first Sultan of Delhi. 3. Historical accounts state that he died in 1210 AD in Lahore. 4. His death occurred accidentally due to a fall from his horse while playing Chaugan (a form of polo). 5. Comparing with the options: - (A) Stabbed by nobles: Incorrect. - (B) Killed in battle with Taj-u-din Yildiz: Incorrect. - (C) Injuries while besieging Kalinjar: Incorrect (he campaigned there earlier but didn't die from it). - (D) Died after a fall from his horse while playing Chaugan: Correct. 6. The correct answer is (D).