Which one is a Metaphor?

1. He is as good as his brother.
2. He is the star of the family.
3. She sang like a cuckoo.
4. The boy takes after his father.

Answer: He is the star of the family.

Explanation: Metaphor – অর্থ রূপক।
The imaginative use of a word or phrase to describe something ealse, to show that the two have the same qualities.
যেমন – He is the star of the family একটি metaphor.