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Oh geez,this went from me trying to answer your question to, im now asking a question.Im kinda confused because not all of them have commas.
The right answer is A. because the possession would be Howard's fault and the contraction would be it's.
hope this help you out and good luck
Answer:
C: Dogs are better pets than cats because canine companions are more reliable, friendly, and sociable than feline companions.
:))