Final answer:
Placental abruption is the correct answer. It is a condition where the placenta separates from the uterus before delivery, causing painful vaginal bleeding and late decelerations.
Step-by-step explanation:
The correct answer to this question is Placental abruption (Option b).
Placental abruption, also known as abruptio placentae, is a condition where the placenta separates from the uterus before delivery. It can cause painful vaginal bleeding and late decelerations, which are a sign of fetal distress. This is considered a medical emergency and requires immediate medical attention.