a) Kant's Categorical Imperative
b) Mill's Principle of Utility

You must first explain the author's argument then give a step by step argument explaining why you think the argument is plausible or implausible. If you defend the argument you must explain a possible objection (problem) and explain why the author would be able to respond to it. If you attack the argument you must also explain a possible objection and explain why the author’s argument cannot respond to the objection. Note: You may also create a 'middle of the road' position by showing that the author can respond to part of, but not all of, the objection.