Which Statement About Sensitive Periods in Prenatal Development Is TRUE

Multiple Choice

Which statement about sensitive periods in prenatal development is TRUE?

A) All major organ systems share the same sensitive period.
B) Teratogens have the most serious effect on prenatal development immediately before a system's sensitive period.
C) A sensitive period is the time when a system's basic structures are being formed.
D) The sensitive period of limb development occurs several weeks before the limbs begin to form.