When a man inhales air containing normal concentration of ${O_2}$ as well as $CO$ he suffers from suffocation because

  • [AIIMS 1993]
  • A

    $CO$ reacts with ${O_2}$ reducing its percentage in air

  • B

    Haemoglobin combines with $CO$ instead of ${O_2}$ and the product cannot dissociate

  • C

    $CO$ affects diaphragm and intercostal muscles

  • D

    $CO$ affects the nerve of the lungs

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