Choose the correct sentence for the essential nutrient element required by plants in the greatest amount.

  • A
    It is required for all phosphorylation reactions.
  • B
    It is needed in the synthesis of auxin.
  • C
    It is one of the major constituents of proteins,nucleic acids,vitamins,and hormones.
  • D
    The best-defined function of it is in the splitting of water to liberate oxygen during photosynthesis.

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