I think it might be “It introduces the story and sets up the coming events.” I’m not sure so take this with a grain of salt...
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The plot is the actual story around which the entire book is based. A plot should have a very clear beginning, middle, and end—with all the necessary descriptions and suspense, called exposition—so that the reader can make sense of the action and follow along from start to finish. Every story has a conflict to solve.
C becuase c and d would make sense becuase d