Which analogy shows a part-whole relationship?

Question

A fin is to a fish as flight is to a bird.
A fin is to a fish as flight is to a bird.
A fin is to a fish as singing is to a bird.
A fin is to a fish as singing is to a bird.
A fin is to a fish as a nest is to a bird.
A fin is to a fish as a nest is to a bird.
A fin is to a fish as a wing is to a bird.

Answer 1

A fin is to a fish as a wing is to a bird.