Answer and explanation

Correct answer: D. a well-known author

  1. Step 1: A hyphen joins words that work together as a single adjective before a noun.
  2. Step 2: 'A well-known author' is correct.
Answer
a well-known author.
Why not the others: a well known-author: The hyphen joins the wrong words. a well-known-author: The second hyphen is unnecessary. a-well known author: The hyphen joins the article to the adjective.

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