Since the Early 1900s,a Trend Has Been Observed in Which

Since the early 1900s,a trend has been observed in which American females are menstruating earlier on average,and the onset of menstruation occurs earlier than for females from other countries.What might explain these differences?

A) American girls tend to be more sexually precocious.
B) Excessive dieting in young females can trigger early menarche.
C) Improved nutrition and health care have influenced the occurrence of menarche.
D) Other countries attempt to medically slow the process of menarche due to religious beliefs.

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