The following question, consist of two words each that have a certain relationship to each other, followed by four lettered pairs of words. Select the lettered pair that has the same relationship as the original pair of words:
Air : Atmosphere :: Water : ?

A. Hydrosphere

B. Ecosphere

C. Biosphere

D. Stratosphere

Answer: Option A

Solution(By Examveda Team)

First constitutes the second.