A large-scale survey found that compared with children born to men aged 20 to 24 years, children born to men over 45 years of age were 25 times more likely to suffer from bipolar disorder and 12 times more likely to suffer from attention disorder. The risk of autism is 3.5 times that of the former, and the risk of suicidal behavior or drug abuse is 2.5 times that of the former. From this, research experts have concluded that delayed childbearing in men has a greater negative effect on the mental health of children. Which of the following, if true, would best support the conclusions of the above experts? ['Most men who have delayed fertility mature late.', 'omen have less negative effects on childbearing than men.', 'Children born under 45 have a lower risk of mental illness than men over 45.', 'f parents are over 40 years old, the risk of having unhealthy children is higher.']