The 3rd-person omniscient narrative voice is most likely being employed here. The writing is in the 3rd person, and the narrator apparently can give access to Chad's thoughts, which suggests that the narrator is writing from a perspective that knows everything related to the story.
Answer:
My friend John, who owns a chocolate Lab Puppy, is getting ready to leave for a trip.
Explanation:
A nonrestrictive modifier does not restrict the meaning of the noun or sentence. Compared to the other choices, this sentence doesn't restrict the meaning of the sentence.
