Answer: The best example of literary nonfiction is C. An essay that relates an activist's experiences fighting for civil rights.
Step-by-step explanation: Literary nonfiction is a genre of writing that consists in narrating events that actually occurred in real life, but using literary techniques. Essays, biographies and memories can be included within this genre. Moreover, the best example of literary nonfiction among the options is C. (an essay that relates an activist's experiences fighting for civil rights) because it makes reference to situations that actually took place in the real world and that affected a real person (an activist that fought for civil rights).