Concept:Logical order of sentences follows a cause-and-effect or chronological flow. The first sentence after the given opening should state the main purpose, then the expansion, then specific examples, and finally current roles.
Explanation:Sentence P introduces the UN’s purpose: preventing future conflicts. This logically comes first.
Sentence Q explains that the UN later expanded its roles, so it follows P.
Sentence S gives a specific example of those roles (peacekeeping), so it comes after Q.
Sentence R describes the UN’s current focus areas (climate change, human rights), making it the last part before the closing sentence.
Thus, the correct sequence is P → Q → S → R, which matches option D (PQSR).
Answer:D. PQSR