Answer:
D. vena cava → right atrium → right ventricle → pulmonary artery
Explanation:
This is an example of pulmonary circuit.
Venae cavae are a vessels (vena cava interior and superior) that carriy deoxygenated blood from the body to the right atrium. From the right atrium through the tricuspid valve the blood goes into the right ventricle. Then, from the right ventricle through the pulmonary valve the blood goes into the main pulmonary artery which carries deoxygenated blood to the lungs (to recieve oxygen).
