Step 1: Identify the initial dynasty.
The Delhi Sultanate commenced with the Slave dynasty (1206–1290 CE). Therefore, the Slave dynasty is the earliest.
Step 2: The Khilji dynasty follows.
The Khilji dynasty reigned from 1290–1320 CE, succeeding the Slave dynasty.
Step 3: The Tughlaq dynasty is next.
The Tughlaqs ruled from 1320–1414 CE, following the Khilji dynasty.
Step 4: The Lodhi dynasty concludes the Sultanate.
The Lodhis (1451–1526 CE) were the final rulers of the Delhi Sultanate prior to Babur’s invasion.
Step 5: Conclusion.
The accurate chronological order is: Slave → Khilji → Tughlaq → Lodhi, corresponding to D, A, C, B.