A research team sent two batches of testers to sleep in the sleep laboratory overnight. The first batch was scheduled to sleep late, thereby reducing the total sleep time; the second batch was scheduled to sleep early, but repeatedly during the sleep process. Was awakened. After the second night, the results were already apparent: the positive emotions of the second batch of testers were severely affected. Their energy levels were lower, and their positive emotion indexes such as compassion and friendliness declined, and some researchers reported It is believed that being awakened caused the tester not to get enough slow-wave sleep, and slow-wave sleep is the key to restoring energy, but some researchers have questioned the credibility of this study. Which of the following, if true, is the most capable of refuting the questioner? ['The decline in the positive sentiment index of the first batch of testers is not obvious.', 'Most of the second batch of testers have not been emotionally active for a long time.', 'The health status and psychological quality of the two batches of testers were already very close.', 'Two groups of testers had uneven energy levels before participating in the sleep experiment.']