Use the information in the works cited page to answer the question.

A sample of Works Cited. Brown, Laaren, and Lenny Hort. Nelson Mandela. New York: D K Pub., 2006. Print. Keller, Bill. Tree Shaker: The Story of Nelson Mandela. Boston: Kingfisher, 2008. Print. Kramer, Ann. Mandela: The Rebel Who Led His Nation to Freedom. Washington, D C: National Geographic, 2008. Print.

The dates listed in the works cited page indicate

important years in Mandela’s life.
eventful years in the author’s life.
years in which the sources were published.
years in which the student conducted research.