The labeling of otherwise high-calorie foods as "sugar-free, " based on the replacement of all sugar by artificial sweeteners, should be prohibited by law. Such a prohibition is indicated because many consumers who need to lose weight will interpret the label "sugar-free" as synonymous with "low in calories" and harm themselves by building weight-loss diets around foods labeled "sugar-free. " Manufacturers of sugar-free foods are well aware of this tendency on the part of consumers. Which one of the following principles, if established, most helps to justify the conclusion in the passage? ['Product labels that are literally correct but cannot be interpreted by the average buyer of the product without expert help should be prohibited by law.', 'Product labels that are literally correct but will predictably be misinterpreted by some buyers of the product to their own harm should be prohibited by law.', "Product labels that are literally correct, but only on one of two equally accurate interpretations, should be prohibited by law if buyers tend to interpret the label in the way that does not match the product's actual properties.", 'Product labels that are literally incorrect, but in such an obvious manner that no rational consumer would rely on them, should nevertheless be prohibited by law.']