38 yo F G3P3 is evaluated for heavy vaginal bleeding after spontaneous vaginal delivery. Labor was induced via oxytocin infusion at 38 wks gestation for gestational HTN. Delivery of placenta* assisted by traction on umbilical cord* &uterine massage occurred 30 minutes later. Immediately after placental delivery, profuse vaginal delivery & Severe lower abd pain began. 1st pregnancy ended at term w/C section due to fetal HR abnormalities. BP 90/60. Exam profuse vaginal bleeding w/smooth round mass at introitus. Management?
a) Uterine massage and oxytocin infusion
b) Emergency hysterectomy
c) Manual exploration of the uterine cavity
d) Uterine artery embolization