Did you see . . . . . . . . man that I told you about? A. a B. an C. the D. no article

The correct answer is: no article.

The man that the speaker is talking about is already known to the listener, so we do not need to use an article. If we used an article, it would imply that the speaker is introducing the man to the listener for the first time.

• A man would be used if the speaker is referring to a man in general, or if the man is not specifically known to the listener.
• An man would be used if the speaker is referring to a man whose name begins with a vowel sound.
• The man would be used if the speaker is referring to a specific man who is already known to the listener.

In this case, the speaker is referring to a specific man who is already known to the listener, so we do not need to use an article.