Final answer:
A nonstress test (NST) is considered reactive when there are two or more accelerations of fetal heart rate of 15 beats/min or more with fetal movement within 20 minutes. The correct option is (d).
Step-by-step explanation:
The correct answer to the student's question is that a nonstress test (NST) in which two or more fetal heart rate (FHR) accelerations of 15 beats/min or more occur with fetal movement in a 20-minute period is classified as reactive. This type of NST result is a positive sign that the fetus is healthy and responding well.
It's different from the Apgar score, which is a quick test performed on a newborn at 1 and 5 minutes after birth to determine an infant's heart rate, respiration, muscle tone, reflex response, and skin color.
These measures are crucial as they help health professionals to understand how well the baby is doing outside the womb and whether immediate medical care is needed. A score of 8 or above indicates that the newborn is in good health, whereas a score below 7 might signal the need for medical assistance.