A nurse is admitting a client who is at 30 weeks of gestation and is in preterm labor.The client has a new prescription for betamethasone and asks the nurse about the purpose of this medication.The nurse should provide which of the following explanations?

Choice A rationaleBetamethasone does not directly increase the fetal heart rate. Factors influencing fetal heart rate include fetal oxygenation, maternal hydration, and medications affecting the maternal or fetal autonomic nervous system. Normal fetal heart rate ranges from 110 to 160 beats per minute.Choice B rationaleBetamethasone is a corticosteroid administered to pregnant women at risk of preterm delivery to accelerate fetal lung maturity. It stimulates the production of surfactant, a lipoprotein that reduces surface tension in the alveoli, preventing collapse upon expiration and improving the neonate's ability to breathe independently.Choice C rationaleBetamethasone does not halt cervical dilation. Cervical dilation is primarily influenced by uterine contractions and the presenting fetal part. Medications like tocolytics, such as terbutaline or magnesium sulfate, are used to inhibit uterine contractions in preterm labor.Choice D rationaleBetamethasone is not used to stop preterm labor contractions. Its primary purpose is to enhance fetal lung maturation. Tocolytic medications are the class of drugs used to attempt to delay or stop preterm labor contractions, allowing time for corticosteroids to be administered.