Read the excerpt below from the article “Barack Obama” on AALBC.com and answer the question that follows.

Barack Obama was born in Hawaii on August 4th, 1961. His father, Barack Obama, Sr., was born and raised in a small village in Kenya, where he grew up herding goats with his own father, who was a domestic servant to the British.
Barack’s mother, Ann Dunham, grew up in small-town Kansas. Her father worked on oil rigs during the Depression, and then signed up for World War II after Pearl Harbor, where he marched across Europe in Patton’s army. Her mother went to work on a bomber assembly line, and after the war, they studied on the G.I. Bill, bought a house through the Federal Housing Program, and moved west to Hawaii.
It was there, at the University of Hawaii, where Barack’s parents met. His mother was a student there, and his father had won a scholarship that allowed him to leave Kenya and pursue his dreams in America.
Barack’s father eventually returned to Kenya, and Barack grew up with his mother in Hawaii, and for a few years in Indonesia. Later, he moved to New York, where he graduated from Columbia University in 1983.
Source: “Barack Obama.”African American Literature Book Club. AALBC.com, LLC, n.d. Web. 29 Sept. 2011.

Which type of nonfiction is this excerpt? Why?
A.
It is an essay because President Obama gives his opinion about something.
B.
It is a biography because a third party tells the story of President Obama’s life.
C.
It is an autobiography because President Obama tells the story of his own life.
D.
It is a memoir because President Obama tells his own story and focuses on memories of specific experiences.

D has already been proven incorrect....pls help...