Which is the best reason a writer would use a unreliable narrator

Explanation:

Authors sometimes use an Unreliable Narrator to tell the story, a protagonist who can't be trusted to tell the events accurately. Either they are insane, evil, delusional, forgetful, or just plain wrong... whatever their reasons, the writer uses this technique to 'hook' the reader.

the independent variable, or the one that is intentionally manipulated is the speed.