Which gases are present in the biogas produced during sewage treatment?

  • A
    $CH_4, CO_2, H_2S$
  • B
    $CH_4, CO_2, NH_3, H_2$
  • C
    $CH_4, CO_2, H_2$
  • D
    $CH_4, CO_2, H_2S, NH_3$

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