For his informative speech, Douglas told his classmates how to get free food at a drive-through restaurant. Rather than focusing on legitimate deals, such as student discounts of coupons, Douglas talked about ways to trick employees into believing you had already paid for the food when you hadn't. His instructor gave the speech a poor grade because it violated the ethical criteria for public speaking presented in your textbook. What guideline was violated?
Make sure your goals are ethically soundq

making sure your goals are ethically sound

Explanation:

Based on the scenario being described within the question it can be said that the guideline that was violated would be making sure your goals are ethically sound. This is mainly because the techniques that are being demonstrated by Douglas on how to get free food all revolve around tricking employees which ultimately leads to them losing money or in some cases their jobs, which makes this unethical.

answer; (c) on the left side; ; ; ; ; ; ; ; ; ; ; ; ; speech is localized on the left side of the brain;

answer; (d) none of the above;