Final answer:
D) Vaginal bleeding in a client scheduled for a cesarean delivery is significant and would indicate the need to contact the health care provider, as it may signal an emergency condition like placental problems.
Step-by-step explanation:
The correct answer to the question of which assessment finding would indicate the need for the nurse to contact the health care provider for a client scheduled for a cesarean delivery is D) Vaginal bleeding. This is significant because vaginal bleeding could be indicative of placental problems such as placenta previa or placental abruption, which can be emergencies requiring immediate medical attention. The other options such as contractions every 10 minutes, a fetal heart rate of 140 bpm, and the presence of fetal station are typical findings during labor and are generally not concerning.