Which one of the following is one of the paths followed by air or $O_2$ during respiration in the adult male $Periplaneta$ $americana$ as it enters the animal body?

  • A
    Spiracle in metathorax,trachea,tracheoles,oxygen diffuses into cells
  • B
    Mouth,bronchial tube,trachea,oxygen enters cells
  • C
    Spiracles in prothorax,tracheoles,trachea,oxygen diffuses into cells
  • D
    Hypopharynx,mouth,pharynx,trachea,tissues

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