Which nonfiction genre is defined as a story of real peoples' lives told by other people?

A. autobiography
B. fiction
C. biography
D. self-help

C. biography

The nonfiction genre that is defined as a story of real peoples' lives told by other people is C. biography.

The nonfiction genre that is defined as a story of real people's lives told by other people is called biography. To figure out the answer, you can break down the answer choices and analyze their meanings:

A. Autobiography: An autobiography is a nonfiction genre in which a person writes the story of their own life.
B. Fiction: Fiction refers to literature that is made up, invented, or imagined. It is not based on real events or people.
C. Biography: A biography is a genre of nonfiction where a writer tells the story of someone else's real life, often focusing on their achievements, experiences, and personal journey.
D. Self-help: Self-help books are nonfiction works that provide guidance, advice, and strategies for personal development or solving specific problems.

By comparing the definitions of these genres, you can determine that the correct answer is C. biography.