Answer:
The correct answer is the last one: It is written by the author about his or her own life.
Autobiography represents a self-written account of one's life. In autobiography, the writer writes about his/her life and important events, thus including both victories and failures. The purpose of the autobiography is to make people inspired by it, and to leave a legacy for its readers. An example of an autobiography is 'The Autobiography of Benjamin Franklin', written by Benjamin Franklin.
