GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - OP5TD9OL5NSVZG17J

Which of the following, if true, most seriously undermines the proposed explanation? A. The fee for admission to the Rivera is no larger than that charged by other museums B. The Rivera does not keep track of how long individual visitors stay in the museum C. The decline in visitors to the Rivera has been no greater in workdays than it has been on nonworking days D. The museum with the smallest decline in visitors is the most popular with visitors from other countries E. In the period between the announcement that there would be an admissions charge and its actual introduction, there was an increase in visitors at the Rivera.