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Which characteristics does Thurber use to classify Macbeth as a murder mystery?

Humor and Wit

Explanation:

"The Macbeth Murder Mystery" written by James Thurber is a story of two detectives who are in search of finding true meaning of the Shakespeare's play Macbeth.

Thurber uses Humor and Wit on a lighter note to bring his version of story. Two of the detectives are introduced to bring various interpretations to his story.

One of the character is the narrator and the other is an American woman.

The narrator believes the story to be a tragedy whereas the American woman finds it as a detective story.  

There are elements of fun as the narrator finds the woman as strange. He calls her 'murder specialist', 'informant' to mock her detective skills.

Thurber cleverly employs such themes to explain that there can be multiple interpretations based upon our reception. American woman finds it as a detective story as she is mostly into them.