What accurately describes a placenta previa in relation to Cesarean sections?

The correct answer describes a scenario where the placenta is positioned in a way that obstructs the cervix, which can lead to complications during delivery. In the case of placenta previa, the abnormal placement of the placenta is significant because it can impede a vaginal delivery, necessitating a Cesarean section to ensure the safety of both the mother and the baby.

When placenta previa occurs, the placenta may cover part or all of the cervical opening, which can cause bleeding and risk for both the mother and fetus during labor. Therefore, a Cesarean section is often planned to avoid the dangers associated with a vaginal birth in these cases. This understanding underscores the importance of prenatal care and the monitoring of placenta location throughout pregnancy to anticipate the necessity for surgical intervention.

In contrast, the other scenarios presented do not accurately reflect the clinical implications associated with placenta previa. Descriptions of the placenta being delivered ahead of the fetus, attaching abnormally to the uterine wall, or being positioned higher than normal do not encompass the critical aspect of how placenta previa directly affects the cervix and the mode of delivery.