Use the correct question tag. The boy is working hard, _________ ?Ais he ?Bis I ?Cisn't he ?Dis you ?Answer: C. isn't he ? Read Explanation: The statement is:The boy is working hard, _________ ?Rules for question tags:A positive statement takes a negative question tag.The subject "The boy" becomes "he" in the tag.The auxiliary verb "is" changes to "isn't". Read more in App