<span>The best inference to make is that the dog is smart and was able to smell where his snack was. Also maybe the dog is proffesionally trained</span>
It is better to not use rhetorical questions in a research paper because it adds informality. A rhetorical question is asking the readers something in second person and a research paper should always be written in third person.
I believe C is correct, after reading through a few times I don't feel as though there is a defined topic sentence. The paragraph just seems to list facts without any true purpose.
Describe the person or story in a short paragraph.
