When the Fetus Makes the Transition to Becoming a Newborn

When the fetus makes the transition to becoming a newborn and extrauterine life begins, there occurs a series of changes, including decreased pulmonary vascular resistance, increased pulmonary blood flow, increased pressure of the left atrium, decreased pressure of the right atrium, and closure of which of the following structures?

A) foramen ovale
B) ductus venosus
C) inferior vena cava
D) superior vena cava