The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below,the one part $A, B, C$ or $D$ is correctly identified along with its function?

  • A
    $C$: Arterial capillary - Passes oxygen to tissues
  • B
    $A$: Alveolar cavity - Main site of exchange of respiratory gases
  • C
    $D$: Capillary wall - Exchange of $O_2$ and $CO_2$ takes place here.
  • D
    $B$: Red blood cell - Transport of $CO_2$ mainly

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