Travel industry consultant: Several airlines are increasing elbow room and leg room in business class, because surveys show that business travelers value additional space more than, say, better meals. But airlines are overconcerned about the comfort of passengers flying on business; they should instead focus on the comfort of leisure travelers, because those travelers purchase 80 percent of all airline tickets. Which one of the following, if true, most weakens the reasoning in the travel industry consultant's argument? ['Some airlines have indicated that they will undertake alterations in seating space throughout the entire passenger area of their planes in the near future.', 'Business travelers often make travel decisions based on whether they feel a given airline values their business.', 'Sleeping in comfort during long flights is not the primary concern of leisure travelers.', "A far greater proportion of an airline's revenues is derived from business travelers than from leisure travelers."]