The correct answer for this question is this one: "2. by describing a mysterious and nervous stranger." The part of Lanyon’s letter help create suspense <span>by describing a mysterious and nervous stranger. It is quite uneasy for a person to meet a stranger. It is something that is new for him or her.
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An abstract noun is a noun that you can't feel, hear, taste, smell, and see. Like hope. A concrete noun is a noun that you CAN feel, hear, taste, smell, and see.
So the abstract noun in this sentence is not choir, but harmony.
hope it helps!
The Yellow Wallpaper Character List. Narrator. Modeled after Charlotte Perkins Gilman,
the narrator in “The Yellow Wallpaper” is a young wife and mother who
has recently began to suffer symptoms of depression and anxiety.
I hope i helped you :p