A television commercial argued as follows: both the product advertised and its competitor contain the same active ingredients, but the product advertised contains them in higher concentrations; tests show that the higher concentrations are completely safe; since a product that provides faster relief is always preferable, one should use the product advertised. The television commercial's argument is most vulnerable to criticism on the grounds that it ['takes for granted that the product with the higher concentration of active ingredients provides faster relief than its competitor', 'attempts to manipulate the emotions of potential customers of the advertised product rather than presenting logically sound reasons for preferring the product advertised', 'attempts to establish its conclusion on the basis of evidence that is in principle impossible to disprove', "dismisses its competitor's claims because of their source rather than their content"]