As per the given above question , we can see that
In row 1, P, Q, R, S and T are seated and all of them are facing south. In row 2, A, B, C, D and E are seated and all of them are facing north.
Four of the following five are alike in a certain way and thus form a group. All others are sitting at the ends .
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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