Which of the following are advantages of ecological sanitation?
$I.$ It is a practical,hygienic and efficient method of waste disposal
$II.$ It is cost effective
$III.$ Human excreta can be recycled into natural fertilisers,to replace chemical fertilisers

  • A
    $I$ and $II$
  • B
    $I$ and $III$
  • C
    $II$ and $III$
  • D
    $I, II$ and $III$

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