Words given on the left side of(::)are related with each other by some Logic/Rule /Relation. Select the missing word/word pair on the right side of(::)from the given alternatives based on the same Logic/Rule/Relation.

Tadpole : Frog :: Caterpillar :?

Butterfly

Tadpole : Frog :: Caterpillar :?

The logic followed here is :

A tadpole is the Juvenile form of Frog

Similarly

A caterpillar is the Juvenile form of Butterfly