Which persuasive device is used when an ad says: “free toaster to the first fifty customers”?

Select the correct answer. which headline do you think is most likely to be effective? a. if you want to stay healthy, take xyz for breakfast, lunch, and dinner b. stay fit, stay healthy with xyz c. health and fitness d. xyz is the magic solution for your entire family to stay fit and healthy e. xyz is your solution for all health and fitness problems