What literary work tells the story of a person's life written by that individual?

The correct answer is an autobiography because this literary work is specifically defined as a narrative of a person's life that they themselves have written. In an autobiography, the author focuses on their own experiences, thoughts, and feelings, reflecting on their life from their own perspective. This genre allows for a personal and unique insight into the person's journey, motivations, and life events.

Other options, while related to personal writing, do not fit the definition as precisely. A biography is written by someone else about a person’s life. A memoir, while also personal, typically focuses on specific events or themes within the author's life rather than encompassing their entire life story. A diary usually contains day-to-day entries and personal thoughts, but it is not structured as a comprehensive life story.