Answer: I would contend that the right answer is the B) Make sure your goals are ethically sound.
Explanation: Just to elaborate a little on the answer, it can be added that if the speech did not inform the audience about legitimate ways for students to get free food (quite the opposite), that was not necessarily an example of plagiarism, name-calling and abusive language, lack of preparation, and lack of adaptation to the audience's frame of reference, but of an attempt to achieve a series of goals that are not ethically sound—such as trying to get free food by telling the employees of the restaurants that you had already paid for it, even though you hadn't.