In Helen Keller's "The Story of My Life," the best example of exposition can be found in option C, when Keller describes the realization she has about words when the water runs over her hand. This part of the text sets the stage for the story by introducing the central theme of the importance and power of words in Keller's life. It lays the foundation for the narrative that follows, where Keller's journey of learning and discovery unfolds.
Exposition is a literary device used to provide background information, establish the setting, and introduce the main characters or ideas in a story. In this case, Keller's realization about words while feeling the water running over her hand serves as a pivotal moment that reveals her understanding of language and communication. It marks the beginning of her exploration into the world of words and symbols, making it a strong example of exposition in the text.