Which best expresses an idea found in the passage?
A) The style of portraits have changed over time.
B) Portraits are often a very profitable genre for artists.
C) Portraits are the most difficult type of painting to do.
D) The most expensive piece of art in the world is a portrait.

Option A is correct

-The answer for the following question that ties in with this one is both C and D

yes, they are. i think.

as for symbolic actions, the narrator's tearing down the wallpaper in an attempt to find the "woman" in the wallpaper represents her struggle to retain or regain her sanity.   the wallpaper has been part of her confinement and by her tearing it down, she is freeing herself from that confinement.