Company spokesperson: Household Products magazine claims that our Filterator X water filter does not remove chemical contaminants in significant amounts. This attack on the quality of our product is undermined by the experience of the millions of Filterator X owners who are satisfied with the product' s performance. Which one of the following, if true, most seriously undermines the company spokesperson's argument? ["Household Products' evaluations of Filterator X water filters have been consistently negative.", 'Household Products did not evaluate whether the Filterator X water filter significantly improved the taste of drinking water.', 'Most Filterator X owners have no way to determine how effectively the product removes chemical contaminants from water.', 'People whose household water contains chemical contaminants are more likely than other people to buy a Filterator X water filter.']