Which of the following is the correct order of basic strength?

  • A
    $MgO < BeO < CaO < BaO$
  • B
    $BeO < MgO < CaO < BaO$
  • C
    $BaO < CaO < MgO < BeO$
  • D
    $CaO < BaO < BeO < MgO$

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