Out of the following biogeochemical cycles which one is 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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