Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)

Bees : Swarm :: Monkeys: ?

Troop 

Logic here is :

Group of Bees is called Swarm .

Similarly ,

Group of Monkeys is called Troop .

Troop is correct answer .