Researchers recently found that people who bought passes to individual fitness classes showed up 99 percent of the time, while those bought a package of five passes in advance only showed up 25 percent of the time. One explanation is that the more aware a gym patron is about the cost of a pass, the more likely that patron is to use it.
Which of the following would, if true, best serve as an alternative explanation of the results of the study?
【选项】
There is sometimes not enough equipment for people who arrive just before a fitness class begins.
选项是否正确？