Concept:The sentence requires logical and grammatical ordering of jumbled phrases to form a coherent meaning.
Explanation:The given chunks are:
P: "emerge at last into a"
Q: "those who passed through"
R: "country of unearthly beauty"
S: "that valley of darkness"
First, identify the subject: "those who passed through" (Q) is the doer.
Next, what they passed through: "that valley of darkness" (S) complements Q.
Then, the action: "emerge at last into a" (P) follows naturally.
Finally, the destination: "country of unearthly beauty" (R) ends the sentence.
This sequence Q-S-P-R forms a grammatical and meaningful sentence: "Those who passed through that valley of darkness emerge at last into a country of unearthly beauty."
Check other options: PRQS places "country of unearthly beauty" before "that valley of darkness", which breaks logic. RPQS inverts subject and verb, causing emphasis shift but still somewhat valid; however, QSPR is more standard. SQRP is ungrammatical as verb "emerge" precedes its subject.
Thus, the correct rearrangement is QSPR.
Answer:B. QSPR