The excerpt from "Fish Cheeks", by Amy Tan, that is most clearly an example of conflict is B. <em>"And then, they arrived...not worthy of existence." </em>A conflict is a struggle between opposing forces.<em></em>The narrator is fourteen, she has a crush on the Minister's son, but she doesn't want him to know it, so she pretends he is not worthy of existence.
I’m not sure what portion you’re referring to, but I would say that he uses the rhetorical device of repetition most effectively, as he repeats “I have a dream”.
