The School Nurse Is Answering Questions About Anatomy and Physiology

The school nurse is answering questions about anatomy and physiology in a middle school science class. One student asks, "How does our body become either a girl or a boy?" Which answer will the nurse provide?

A) "Girls are born more frequently because the mother's sex chromosome is bigger."
B) "Fathers always give a male chromosome and the mother can give one of either sex."
C) "Depending on the sex chromosome from the father, the baby will be a boy or a girl."
D) "There is no single chromosome that makes the sex determination; it's by chance."