Cpr is in progress on a pregnant woman. shortly after manually displacing her uterus to the left, return of spontaneous circulation occurs. which of the following would most likely explain this? - displacement of her uterus allowed her lungs to expand more fully, which restored her pulse.- increased blood flow to her heart caused her ventricles to stop fibrillating, which restored her pulse.- displacement of her uterus caused blood to flow backward, which increased blood flow to her heart.- pressure was relieved from her aorta and vena cava, which improved chest compression effectiveness.