Which of the following represents the correct decreasing order of the first ionization energy for $Ba$,$Sr$,$Ca$,and $Mg$?

  • A
    $Mg > Ca > Sr > Ba$
  • B
    $Ca > Sr > Ba > Mg$
  • C
    $Sr > Ba > Mg > Ca$
  • D
    $Ba > Mg > Ca > Sr$

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