The sentence that does not contain any errors in comma usage is option C. Mick introduced me to his dog, a golden retriever. We used a comma after the word dog because the phrase "a golden retriever" serves as an additional information to the sentence.
Could you please stop using that cliche and say something I haven't heard before?
;)
It is most likely expressive because it focuses on the motivations and fears of the author.
Hope this helps!
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3 because it used all the correct grammar an spacing