Direction.
In these questions, two words will be given to you, and these two words will have some kind of a relationship which relates them in a particular way. After finding this relationship, you have to pick the right option which has words related in a similar way:
FEATHER : BIRD : :
Snake : scale
Bark : tree
Human : epidermis
Hump : camel
Correct Answer :
B. Bark : tree
This is a part to whole problem. The bird is covered by its feathers completely, just as a tree is covered completely by its bark. Neither (a) or (c) can be correct since the order is reverse.