The correct option is
B oxygenated blood
The correct option is B.
Explanation of the correct option:
- The pulmonary vein functions by carrying oxygenated blood from the lungs to the heart (left auricle).
- These blood vessels comprise thinner walls.
Explanation of the incorrect option:
Option A:
- The pulmonary artery functions by carrying venous or deoxygenated blood from the heart to the lungs.
- These blood vessels comprise valves, thicker and elastic walls.
Final answer: Pulmonary vein carries oxygenated blood.