Which of the Following Occurrences Is NOT Likely to Be

Multiple Choice

Which of the following occurrences is NOT likely to be due to environmental factors?

A) Females generally reach puberty before their male peers.
B) In contemporary industrialized nations, adults are several inches taller than their same-sex great-
grandparents were.
C) American girls today tend to begin menstruating a few years earlier than did their ancestors.
D) All of the occurrences are due to environmental
factors.
E) None of the occurrences is due to environmental
factors.