Your answer would have to he A. Noun..
because if "puppy" is underlined then its dealing with a person 'person' 'place' or 'thing' but in this category its a 'thing'. (:
The answer is d unless you messed up typing
D. Students. It would affect the student body the most, and I doubt teachers would like to or need to "take a stand on what you wear". Hope this helps :)