Placenta accreta is the most common kind of placental adherence seen in pregnant women and is characterized by slight penetration of myometrium.Option B: In placenta previa. the placenta does not embed correctly and results in what is known as a low-lying placenta. It can be marginal. partial. or complete in how it covers the cervical os. and it increases the patients risk for painless vaginal bleeding during the pregnancy and/or delivery process.Option C: Placenta percreta leads to perforation of the uterus and is the most serious and invasive of all types of accrete.Option D: Placenta increta leads to deep penetration of the myometrium.