Draw a figure on the basis of above given question ,
Bus M is standing at the front and Q is standing at the back end. Bus N stands between M and O. Bus P stands between O and Q.
From figure , Bus O is in the middle of the five.
Sitting arrangement :-
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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