Superior vena cava brings deoxygenated blood from upper part of blood to right atrium. Inferior vena cava brings deoxygenated blood from lower part of the body to right atrium. Pulmonary artery carries deoxygenated blood to lungs. Pulmonary vein carries oxygenated blood from lungs.
Thus, the correct answer is 'A-4, B-3, C-1, D-2.'