In the alveoli, the formation of oxyhaemoglobin is favoured by

• A

  high pO₂, low pCO₂, low pH and low temperature

• B

  high pO₂, low pCO₂, low H⁺ concentration and low temperature

• C

  high pO₂, low pCO₂, low H⁺ concentration and high temperature

• D

  high pO₂, high pCO₂, high pH and low temperature