Which of the following statements about the secular trend is true?
A. There is currently no evidence that boys have followed the secular trend.
B. Evidence for the secular trend in boys can be found in reports from European children's choirs.
C. Experts agree that the secular trend (for boys and girls) has indeed continued in recent years.
D. Scientists believe that the secular trend is caused by chemicals in the food supply.
B. Evidence for the secular trend in boys can be found in reports from European children's choirs.
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