How is body mass related to the onset of menstruation?
A. Body mass is unrelated to the onset of puberty; rather, onset is caused by the concentration of stress hormones in the body.
B. Girls with a higher percentage of body fat may start menstruating later than girls with a lower percentage of body fat.
C. Rapid weight gain during the period just before puberty (ages 7 to 9, typically) causes earlier onset of menstruation.
D. Girls with a lower percentage of body fat may start menstruating later than girls with a higher percentage of body fat.
Answer: D
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