What actually makes an autobiography different from a memoir is:
C. The level of detail included.
Let's understand what autobiography is all about.
Autobiography actually refers to the writings/biography of someone that is narrated by oneself.
In autobiography, the entire life of the writer/author is clearly written. Such writers tell the story of their lives in autobiography. Memoir actually focuses on a specific part of the author's life.
Thus, the level of details is actually what differentiates an autobiography from a memoir.
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