Which event does not take place when a red blood cell reaches the alveolus?
- ACarbaminohaemoglobin releases carbon dioxide from the $\alpha$-globin and $\beta$-globin polypeptide chains.
- BCarbonic acid in the red blood cell forms carbon dioxide and water.
- CHydrogencarbonate ions diffuse from the plasma into the red blood cell.
- DHydrogen ions are released from haemoglobin acid and diffuse out of the red blood cell.