Answer:
record the reactive (reassuring) fetal reaction.
Step-by-step explanation:
A fetal heart rate is said to be reactive if there is an increase of at least 15 beats per minute over the baseline, (the stipulated baseline usually given is between 120 and 160 beats per minute) lasting at least 15 seconds within a 20-minute period.
In the case of the nurse evaluating a fetal monitor strip and finds out that the fetal heart rate accelerated 20 beats per minutes for 15 seconds, the nurse's best action is to record the reactive (reassuring) fetal reaction.