Which of the following is a common technique advertisers use to mislead consumers into using "fad diets" to achieve optimal health and fitness?
a. requiring aerobic exercise
b. using flexibility movements
c. allowing only one or two food types
d. promoting nutritional balance

The correct answer is C. Allowing only one or two food types

Hope this helps! :)

A common technique that advertisters use to mislead their customers to use fad diets because they themselves want to achieve optimal health and fitness would be C - allowng only one or two food types. Many times the "only one or two food types" kind of diets are being promoted as the final stroke against obesity while in reality they don't really have much weight to them. No pun intended.