What Is the Best Explanation for Why the Age of Menarche

Multiple Choice

What is the best explanation for why the age of menarche has decreased over the past century from around 15 to around 13 years of age?

A) Advances in technology correspond to an earlier age of being able to carry an infant to term.
B) Evolutionary changes are linked to taller and more physically strong women that develop earlier.
C) The change is probably due primarily to better nutrition and health care.
D) The decrease reflects the revolving cycle where women are having children younger and,in turn,the age of reproduction of their children is younger,and so on.