the description of this location goes beyond "soothing nature sounds"--it describes the <em>movement</em>, color, and life flow of the canyon. It mainly focuses on motion, not the "quietest place", and it does not mention "rare wildlife" at all.
The answer is c because the subject is the topic of the story pretty much like if I where to write something about myself I would be the subject and let's say the theme is about bravery and I have to deal with that so yeah C
