The reaction $2 NH_3 + 3 O_2 \rightarrow 2 NO_2^- + 2 H^+ + 2 H_2O$ is carried out by which of the following microorganisms?

  • A
    Nitrosomonas
  • B
    Nitrococcus
  • C
    Nitrobacter
  • D
    Both $A$ and $B$

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