Out of the following biogeochemical cycles, which ones are gaseous?
$I.$ Sulphur
$II.$ Phosphorus
$III.$ Nitrogen
$IV.$ Carbon
Choose the correct option.

  • A
    $Only \; I$
  • B
    $Only \; II$
  • C
    $Only \; IV$
  • D
    $III \; and \; IV$

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