I believe the answer is Stressful circumstances may force a young person to grow up quickly.
Anne was extremely mature for her age. This was due to the situation she was forced to endure as she had to either adapt or risk losing her life.
I think that the best answer is C.
Fairfield is a town, so it would be very weird for a community pool to be bigger than it: all the other comparisons actually make a point, as the things compared are more similar