A disease always has a Cause.
A mountain has always a height. A mountain cane be without Ranger , Snow and Valley. So a mountain should have the Peak.
.
A child can be without Toys, Education and Friends but cannot be without parents. So child must have had a parents.
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).
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