Final answer:
After amniocentesis, the expected result of an NST is fetal heart rate acceleration.
Step-by-step explanation:
After amniocentesis, the Non-Stress Test (NST) is used to monitor the fetal heart rate. The expected result of an NST is a) Fetal heart rate acceleration. This means that the fetal heart rate should increase in response to fetal movement or contractions. Fetal heart rate deceleration, no change in fetal heart rate, or an irregular fetal heart rate would be considered abnormal and may require further medical evaluation.