Your Roommate Has the Right to Play Her Stereo During

Multiple Choice

Your roommate has the right to play her stereo during the day. But you find the best time to study is during the day, and the stereo playing makes it hard for you to concentrate. You tell your roommate that you will do her laundry every week if she does not play the stereo during the day and she agrees to this. This is an example of

A) the drop-in-the-bucket problem.
B) liability rules.
C) the Coase theorem.
D) an injunction.