Open Question: One stage of puberty for girls is ________, which is the onset of the menstrual cycle. This usually occurs…?

One stage of puberty for girls is ________, which is the onset of the menstrual cycle. This usually occurs at or around age ________.
A. menopause; 16
B. menarche; 12
C. genitalia; 8
D. ovulation; 10

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