The correct chronological order of the three major Delhi Sultanate dynasties is indeed: Slave (Mamluk) Dynasty (1206-1290), then Khilji Dynasty (1290-1320), then Tughlaq Dynasty (1320-1414). The Slave dynasty was founded by Qutb-ud-din Aibak, followed by the Khiljis under Jalal-ud-din Khalji, and then the Tughlaqs under Ghiyas-ud-din Tughlaq. Options A, B, and C all have incorrect sequences.