Select the correct matches.
$I$ Nitrosomonas - Nitrite to nitrate
$II$ Thiobacillus - Denitrification
$III$ Nostoc - Free-living nitrogen-fixer
$IV$ Azotobacter - Anaerobic nitrogen-fixer

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

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