Which analogy shows a part-whole relationship?

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A fin is to a fish as singing is to a bird.
A leaf is to a tree as a petal is to a flower.
City is to state as state is to town.
A second is to a minute as a minute is to a month.

A leaf is to a tree as a petal is to a flower.

The analogy that shows a part-whole relationship is: A leaf is to a tree as a petal is to a flower.

The analogy that shows a part-whole relationship is: "A leaf is to a tree as a petal is to a flower."

To understand this analogy, we need to recognize the relationships between the parts and wholes mentioned. In this case, a leaf is a part of a tree, just as a petal is a part of a flower. The analogy is highlighting the relationship where the part (leaf or petal) is a component of the whole (tree or flower).