I'm bored who wanna talk

ohh you are meee

your a mood

An autobiography is a biography written by the person who is writing about themselves. A memoir is written by someone else about a different person, someone they knew or were intimate with; based on personal observation.
I would say the answer to be B, out of all of them. A is a bit vague, because both can cover their entire lives, obviously not when they're dead though. C isn't true because both can be oral and written. And D doesn't make sense.