Choose the correct sentence.

  • A
    Phosphorus is a constituent of the ring structure of chlorophyll.
  • B
    $Ca^{+2}$ is an activator for $RuBisCO$.
  • C
    The best-defined function of nitrogen is in the splitting of water to liberate oxygen during photosynthesis.
  • D
    $Zn^{+2}$ is an activator of alcohol dehydrogenase.

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