'Do not lean out' implies that this act can be dangerous. Hence, Assumption II is implicit. The purpose of a notice is getting response from targeted mass. Therefore, without assuming response from targeted mass, there will be no such notice. Clearly, Assumption II is also valid.
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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