What does the exposition of a story usually tell the reader

Which situation from a novel best reflects the following theme? prejudice can be found in unexpected places and is always hurtful to those exposed to it. a. community members admire a public figure until a child exposes him as a fraud b. witnesses to a violent attack remain quiet for fear of endangering their families o c. a talented doctor cannot get work in a neytown because he is an "outsider." d. a couple tries to keep their romance alive across a great distance but fails.