Blood is poured into the left atrium through.
Pulmonary vein
The correct option is B:
Superior vena cava:
Superior vena cava carried deoxygenated blood from the head, chest, and neck region and pours to the right atrium.
Inferior vena cava:
Inferior vena cava also carries deoxygenated blood from the legs, feet, and pelvic region and pours to the right atrium.
Pulmonary artery:
The pulmonary artery carries deoxygenated blood from the right ventricles to the lungs.