UPSC CDS English Ordering of Words in a Sentence Part 1 Questions

The pair SP is a logical pair as P cannot follow R and Q, and S cannot follow P. Grammatically, Q and R cannot be the last part of the sentence. Hence, it is clear that the pair SP follows either Q or P. Among the given options, only (a) contains SP as the second pair. Thus, it is clear that the correct option is (a).