Which persuasive technique involves the promotion of a service or product by a famous athlete or movie star in exchange for large sums of money?

But one hundred years later, the negro still is not free. one hundred years later, the life of the negro is still sadly crippled by the manacles of segregation and the chains of discrimination. one hundred years later, the negro lives on a lonely island of poverty in the midst of a vast ocean of material prosperity. one hundred years later, the negro is still languishing in the corners of american society and finds himself an exile in his own land. so we have come here today to dramatize a shameful condition. in paragraph 3, which rhetorical technique is being used to add emphasis? a) overstatement b) understatement c) parallel structure d) rhetorical question

How does including this excerpt at the beginning of the essay contribute to his argument post

In 300 words or less, summarize the prologue