The structure of orthophosphoric acid is

  • A
    $H-O-P(=O)(OH)_2$
  • B
    $O \leftarrow P(OH)_2(H)-O-H$
  • C
    $O \leftarrow P(H)_2-O-H$
  • D
    $H-O-P(=O)=O$

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