How does diction affect theme in a story?

 It affects the mood, which affects how the theme is interpreted by the reader. 

The diction is simply the choice of words the writer used in the story. This easily distinguishes a good from a bad writing. The words used in a literature should be accurate and appropriate to the context of the idea that is being used to, therefore, the diction affects how the theme of the story is being received by a reader. The reader’s interpretation of the theme of the story will be influenced by the choice of words used in constructing the story. 

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