How does the narrator's room inform both her character and plot?

A. The room is essentially hidden away from the rest of the house, informing her loneliness and exacerbating her depression.

B. The room is on the top floor in which she is locked away like a fairytale princess, reflecting her tendency towards whimsy and foreshadowing her eventual escape.

C. The room is a former nursery with bars on its windows, emphasizing her treatment as a child/prisoner and thus the eventual break from her identity as a sane adult woman.

D. The room is described as open and airy, contrasting her mental state and actual situation.