Final answer:
The nurse should stop the oxytocin infusion during labor induction if contractions occur at 2 min intervals and last more than 90 secs, as this might indicate excessive uterine activity.
Step-by-step explanation:
During labor induction with oxytocin, the nurse should stop the infusion if contractions are at 2 min intervals and last more than 90 secs (Option B). Oxytocin, a hormone produced by the posterior pituitary, plays a critical role in labor by stimulating uterine contractions that help the cervix dilate and efface. Throughout the process of labor, it's essential to ensure that contractions are effective yet safe. If they become too frequent or too long, it may indicate excessive uterine activity, which can put the mother and the baby at risk. Therefore, monitoring the frequency and duration of contractions is crucial, and infusion of synthetic oxytocin, known as Pitocin, is adjusted accordingly.