A declarative sentence is a statement. Such as, "I went to the park yesterday." That is declarative, because it is stating a fact. Another way to know it's declarative is, all declarative sentences end in periods. But you shouldn't get these mixed up with imperative which are commands. Hope this helped!
The preposition is 'I' I think. I could be wrong.
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.
