What Is the Definition of Placenta Previa

Multiple Choice

What is the definition of placenta previa?

A) A condition where the placenta grows through the uterine wall
B) A condition where the placenta is implanted low in the uterus, sometimes covering the cervix
C) A condition where the placenta begins to detach from the uterine wall before the birth of the baby
D) When the umbilical cord enters the birth canal ahead of the baby