Annabeth's actions in Chapter 18, when she distracts Cerberus with the red ball she stole, prove that she is intelligent and quick on her feet, always preparing. These are all traits of a daughter of the goddess Athena.
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The reason a character thinks, feels, or acts a specific way is called character motivation.
Character motivation is the reason behind a character's behaviors and actions in a given scene or throughout a story.
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