Step 1: Identify earliest dynasty.
The Delhi Sultanate began with the Slave dynasty (1206–1290 CE). Hence, Slave comes first.
Step 2: Followed by Khilji dynasty.
The Khilji dynasty ruled from 1290–1320 CE. Thus, Khilji comes after Slave.
Step 3: Next is Tughlaq dynasty.
The Tughlaqs ruled from 1320–1414 CE. Hence, Tughlaq follows Khilji.
Step 4: Finally Lodhi dynasty.
The Lodhis (1451–1526 CE) were the last rulers of the Delhi Sultanate before Babur’s invasion.
Step 5: Conclusion.
The correct chronological sequence is: Slave → Khilji → Tughlaq → Lodhi, i.e. D, A, C, B.