Which Statement Regarding the Development of the Respiratory System Is

Which statement regarding the development of the respiratory system is a high priority for the nurse to understand?

A) The respiratory system does not begin developing until after the embryonic stage.
B) The infant's lungs are considered mature when the L/S ratio is 1:1,at approximately 32 weeks of gestation.
C) Maternal hypertension can reduce maternal-placental blood flow,accelerating lung maturity.
D) Fetal respiratory movements are not visible on ultrasound scans until at least 16 weeks of gestation.