In a town containing a tourist attraction, hotel and restaurant revenues each increased more rapidly over the past year than did revenue from the sale of passes to the attraction, which are valid for a full year. This led those in charge of the attraction to hypothesize that visitors were illicitly selling or sharing the passes. Each of the following, if true, helps to undermine the hypothesis of those in charge of the tourist attraction EXCEPT: ['During the past year other tourist attractions have opened up in the area.', 'While the cost of passes is unchanged since last year, hotel and meal prices have risen.', 'The local board of tourism reports that the average length of stay for tourists remained unchanged over the past year.', 'Those possessing passes made more frequent trips to the attraction last year than in previous years.']