You are called to assist a full term pregnant female who is believed to be experiencing imminent birth with crowning present. Which of the following best describes crowning?
A. When the amniotic sac spontaneously separates from the uterine wall and fluid rushes from the vagina
B. The umbilical cord presents at the vaginal opening as the baby begins to deliver
C. The top of the baby's head is visible in the vaginal opening
D. The placenta is formed in an abnormal location
Answer: C