Answer:
D) puffery
Explanation:
In advertising, puffery refers to promoting a product or services using broadly exaggerated statements or testimonials.
They are legal because they are based on subjective terms (opinions) and not objective terms (measurable facts). E.g. the statement "most delicious steak in the world" cannot be proven wrong because no one can show that their steak is the most delicious.
When you say some product is the best in the world, in order for it o be considered false advertising, you must promise something that is measurable, e.g. you cannot promise a car has the best mileage per gallon in the world if it doesn't because that can be measured.
Instead eyelash volume or definition is not something that can be measured scientifically, you can notice a change but that it basically an opinion. There is no scientific measure of eyelash volume or definition.
In order for puffery to be legal, it must be so exaggerated that any reasonable person should realize it is not possible or extremely unlikely to be true, at least for everyone.