Yes, a square is a rhombus. But a rhombus is not a square unless the interior angles are at right angles.
We know that, a square is a quadrilateral with all sides equal and all the interior angles are 90 deg i.e, at right angles.
Whereas
a rhombus is also a quadrilateral with all sides equal but the interior angles are not at right angles. Hence, if the interior angles of a rhombus are all at right angles (90 deg), then it is square.
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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