Which of the following statements regarding puberty is true?
a) The age at which puberty begins is influenced by the availability within a society of adequate nutrition and medical care.
b) Historical records show a steady increase in the average age of menarche in Western countries from the mid-19th to the late-20th century.
c) A systematic review of studies published between 1980 and 2013 suggests that prenatal and early childhood factors do not affect puberty.
d) Culture does not affect the timing of puberty.
Answer: a
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