A 29-year-old woman delivers vaginally and has ongoing heavy bleeding 30 minutes later. Estimated blood loss is 1200 mL, pulse 120 beats/min, BP 90/55 mm Hg. Uterus is boggy. What is the most appropriate first-line pharmacologic treatment?AHigh-dose IV tranexamic acid onlyBHigh-dose IV oxytocin infusion after uterine massageCMisoprostol rectally as sole treatmentDReassure that this is normal postpartum lochiaEStart broad-spectrum antibiotics onlyCheck my answer