Correct option is B
Option (b) is the correct order of the given sentences.
Explanation of sentence order:
·
C introduces the comparison (principal difference).
·
B continues with what the difference is about – the relation.
·
D explains what kind of relation – lord and vassal.
·
A provides the basis of the relation – by conquest.
Correct sequence: C → B → D → A
�� Tip: Look for noun-pronoun linkages and logical transition of ideas (subject → verb → object/complement).