The answer is B unreliable narrator. This is the correct answer because he is not always trustworthy so you shouldn't rely on this narrator.
The correct answer is B) Unreliable narrator
The Unreliable narrator is a narrator of a story whose credibility has been compromised. This can happen when the character that narrates the story has a problem with another character or has a mental problem or problems with maturity. An unreliable narrator holds a distorted view of the events which leads to an inaccurate telling of the story.