Option A. Don't get stuck in this mindset that the "friends zone" is something horrible and inescapable. It's a really good step to a relationship, especially in your case where she is interested but indecisive. The closer she gets to you in real life (hypothetically) the more she'll like you and grow comfortable with the relationship growing closer.
And enjoy the time you spend with her, whatever is going on. That enjoyment is one of the best parts of being a junior in high school, that you can have fun with this friend and this relationship and there isn't so much pressure.