To solve this question, we need to arrange the jumbled parts of the sentence (P, Q, R, S) in a logical sequence that forms a coherent and meaningful sentence. Let's analyze the given parts:
- R: "Going dark has its uses, Earth Hour" - This part seems to introduce the concept of 'Earth Hour' and suggests that it has certain uses.
- Q: "As it is called, will not reverse global warming" - This part directly follows the mention of 'Earth Hour', providing additional information about the limitations of Earth Hour.
- S: "But it is a good way to raise awareness about" - This part appears to contrast with the previous statement in Q, indicating a positive aspect of Earth Hour despite its limitations.
- P: "The environmental problems the world is facing" - This part completes the thought initiated by 'raise awareness about', specifying what Earth Hour raises awareness about.
Now, let's determine the correct sequence:
- Start with R: "Going dark has its uses, Earth Hour" - This introduces the subject.
- Follow with Q: "As it is called, will not reverse global warming" - This provides further context on Earth Hour.
- Then S: "But it is a good way to raise awareness about" - This indicates a contrasting positive aspect.
- End with P: "The environmental problems the world is facing" - This completes the thought about what Earth Hour raises awareness about.
When arranged in sequence RQSP, the sentence reads: "Going dark has its uses, Earth Hour, as it is called, will not reverse global warming, but it is a good way to raise awareness about the environmental problems the world is facing." This sequence forms a complete, coherent, and meaningful statement.
Therefore, the correct answer is: RQSP.