The given figure shows a small part of the human lung where gas exchange occurs. Identify the part $A, B, C,$ or $D$ correctly with its function from the given options.

  • A
    $C$: Arterial capillary - passes oxygen to tissues.
  • B
    $A$: Alveolar cavity - the primary site of respiratory gas exchange.
  • C
    $D$: Capillary wall - site of oxygen and carbon dioxide exchange.
  • D
    $B$: Red blood cells - primarily transport $CO_2$.

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