Concept:Sequence the middle sentences (P, Q, R, S) logically between S1 and S6 to form a coherent paragraph.
Explanation:S1 introduces Sherlock Holmes and Watson spending a weekend in a university town.
The first middle sentence should describe their accommodation, so R ("They were staying in furnished rooms, close to the library") follows naturally.
Next, P introduces an event: "One evening they received a visit from an acquaintance, Mr. Hilton Soames."
After introducing Soames, S describes his appearance and nature: "Mr. Soames was a tall, thin man of a nervous and excitable character."
Finally, Q tells his state: "On that occasion, he was in a state of great agitation." This leads smoothly to S6, which comments that something unusual had happened.
Thus the correct order is R-P-S-Q.
Answer:R P S Q — Option B