Why does george orwell present animal farm as a fable? a. to show what a perfect society would be like b. to make a moral point at the end of the story c. to poke fun at human governments d. to show that people are easily persuaded by propaganda

This is a bit subjective, but many would agree that the reason why George Orwell presents Animal Farm as a fable is "D. to show that people are easily persuaded by propaganda" since he wants to emphasize that the "true" parts of human society are often hidden.

An autobiography was written by the person that its about while  a normal one is written by another person