Can taking medicine improve a person's ability to recognize pitch? A recent foreign study has given a positive answer to this. The researchers divided the trial participants into two groups: the first group took valproic acid and the second group After taking a placebo, none of the participants in the trial received systematic music training, and found that in the recognition pitch test, the correct recognition rate of the first group was higher. Based on this, the researchers believe that drug treatment can improve People's ability to recognize pitch. Which of the following, if true, would most question the researchers' conclusions? ['There are more participants in the first group than in the second group.', 'The average age of the participants in the first group is different from that in the second group.', 'Participants in the first group of tests were better than those in the second group.', 'The proportion of parents in the first group of trials who are engaged in music work is higher.']