A second person narrator is very uncommon, and will use the words "you" and "your" as subjects. (Some self-insert fanfictions do this, but that's about it.)
A first person narrator is much more common, and it would mean the story is told by a character in the book and use "I, I'm, I've," etc. in places other than dialogue.
Looking up the story, I can see neither of these are the case, so it's probably B.
