Final answer:
The fetal monitor is used during labor to track the baby's heart rate and the mother's contractions.
Step-by-step explanation:
The best response by the nurse is B. 'It monitors the baby's heart rate and your contractions.'
The fetal monitor is used during labor to track the baby's heart rate and the mother's contractions. It helps the healthcare team assess the well-being of the baby and the progress of labor. By monitoring the baby's heart rate, the healthcare providers can detect any signs of distress and make appropriate interventions if necessary.