Concept:The sentences must be arranged to form a coherent paragraph, starting with S1 and ending with S6.
Explanation:S1 introduces the Indian Civil Service as efficient and powerful.
Sentence S logically follows, stating that its members exercised vast power.
Sentence P then adds that they often participated in making policy.
Sentence R introduces that they developed certain traditions.
Sentence Q specifies those traditions as independence, integrity, and hard work.
S6 concludes by noting these qualities served British, not Indian interests.
Thus, the correct sequence is S, P, R, Q.
Answer:D. S P R Q