Which sentence uses the hyphen correctly?

Correct answer: A. She is a well-known author of children's books.

Two words that work together as one adjective before a noun are joined with a hyphen: a well-known author, a full-time job, a two-page memo.

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Answer and explanation

The correct answer is A. She is a well-known author of children's books.

Two words that work together as one adjective before a noun are joined with a hyphen: a well-known author, a full-time job, a two-page memo.