Twelve-year-old Heather has a smaller head circumference and less gray matter thickness than typical children of her same age, sex, and size. It is most likely that
A) Heather's mother used alcohol or other drugs during her pregnancy.
B) Heather's mother has PKU.
C) Heather has PKU.
D) Heather has fragile-X syndrome.

Question

Quizplus · Accepted Answer

Heather's smaller head circumference and reduced gray matter thickness are likely due to prenatal exposure to alcohol or other drugs, as these factors can affect brain development.

Twelve-Year-Old Heather Has a Smaller Head Circumference and Less Gray