The researchers completed two memory experiments. In the first experiment, the participants learned 40 groups of words. In the second experiment, the participants learned a series of finger signals. In both experiments, only half of the participants were told that they would be tested after 10 hours. All the participants on the test will be tested. Only a part of the participants will take a nap between learning and testing. It turns out that the participants in the sleeping group perform better than those who do not sleep; the participants who were told to test in advance The test scores were also high, so researchers believe that sleep helps the brain store memory information that will be useful in the future. If the following are true, what is the most rebuttable conclusion? ['The participants in Experiment 1 are all young people with good memory and studying in a language major.', 'Some participants who were told to take the test did not fall asleep when they were napping, and they unconsciously reviewed what they had learned in their brains.', 'Participants who arrange napping time are younger teenagers, and it is well known that people have better memory in their teenage years.', 'Some of the participants who took a nap in Experiment 2 took the test with a relaxed attitude and achieved good results.']