Can someone please help me with this question?

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

In this unit ,we learned about arguments and rhetoric.in an argument we ,not informal language.

Which inference can a reader make based on the information in the excerpt?