The intent of the author to show the dark side of his characters is to show that humans are not perfect.
<h3>What is Characterization?</h3>
This refers to the role of characters in a play and also the way they are described to the audience either directly or indirectly.
Hence, we can see that from the complete text, we can see that the dark side of people in the story goes to show how fundamentally evil people can be in a given situation and cause harm to others.
Read more about characterization here:
brainly.com/question/1393329
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I believe your is answer would be D.
