Which of the Following Would Be Prohibited by the Obligation

Multiple Choice

Which of the following would be prohibited by the obligation not to treat others "merely as a means"?

A) Your regular plumber doesn't want to work on weekends, but you convince him to do it by offering to pay him double.
B) A teenager lies to her close friend about being busy on his birthday because she needs to go set up for his surprise party.
C) To get a better rate on her student loan, a student forges her mother's signature as a cosigner on her loan application.
D) Two police officers break up a bar fight by dragging one drunk bar patron away from another.