The word PQRS is following the pattern by moving first letters in last one by one.
pqrs/qrsp/rspq/spqr
Set 'sqppqpr' completes the given letter series.
It is irrelavent
Clearly, though all the alternatives may form a part of the atmosphere, the air is the most vital part, without which there can be no atmosphere. So, the answer is (b).
It is true
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