$CO_{2}$ dissociates from carbaminohemoglobin in the alveoli when:

• A
  $pO_{2} = \text{low}, pCO_{2} = \text{high}$
• B
  $pO_{2} = \text{high}, pCO_{2} = \text{high}$
• C
  $pO_{2} = \text{low}, pCO_{2} = \text{low}$
• D
  $pO_{2} = \text{high}, pCO_{2} = \text{low}$