Correct option is C
Given:
Rat : Rodent
Logic: A rat belongs to the category of rodents. This is a relationship between an individual organism and its biological classification.
Lets check by options;
Option (a): Bee : Apiary
This represents the place where bees are kept, not a biological classification. (Does not follow)
Option (b): Sailor : Ship
This represents the association between a sailor and their workplace, not a biological classification. (Does not follow)
Option (c): Whale : Mammal
A whale belongs to the category of mammals. This matches the relationship of an organism and its biological classification, just like Rat : Rodent. (Follow)
Option (d): Nomads : Horde
This represents the group that nomads form, not a biological classification. (Does not follow)
Thus, the correct option is (c).