Her obsession with finding a pattern reveals her imagination and creativity, which is stifled by her husband and by her being forced to spend so much time in the room.
She is depressed, not able to see her new baby, not permitted to have visitors, and shut in at all times. Since she is denied any opportunity for stimulation or creative outlet, she creates one. Her obsession with the wallpaper, and later the insanity it causes, show what kind of a mind she has. Her mind is one that needs to express itself creatively.
'The sweet, smoky scent of toasted marshmallows found her nose as she licked melted chocolate from her fingertips." This is your answer as it explicitly states the sense of smell.
For APEX the correct answer is A. An exploration of ideas
