How did Sultan Qutb-ud-din Aibak die?
(a) He was treacherously stabbed to death by one of his ambitious nobles
(b) He was killed in a battle with Taj-u-din Yildiz, the ruler of Ghazni who entered into a contest
with him over the capture of Punjab
(c) He sustained injuries while besieging the fortress of Kalinjar in Bundelkhand and succumbed to them later
(d) He died after a fall from his horse while playing Chaugan
