Which of the following is a relative contraindication to induction of labor?

A previous classical cesarean delivery is indeed a relative contraindication to the induction of labor. This is due to the increased risk of uterine rupture associated with induction in patients who have had this type of incision. A classical cesarean involves a vertical incision in the upper segment of the uterus, which is less favorable for subsequent vaginal deliveries compared to the more commonly used low transverse incision. Inducing labor in such a scenario raises concerns about the structural integrity of the uterus during contractions, leading healthcare providers to be cautious.

In contrast, healthy twin pregnancies typically do not present a contraindication for induction when certain conditions are met, such as the gestational age being appropriate for delivery and the twins being in a favorable presentation. Normal fetal heart patterns indicate that the fetuses are not in distress, which would support the safety of proceeding with an induction if clinically indicated. Low maternal blood pressure may be a consideration in the overall management of labor, but it is not a direct contraindication to induction itself. The clinical context would guide the management approach, but low blood pressure alone would not preclude induction.