What is the correct order of acidic strength for $Al_2O_3$,$SiO_2$,$P_2O_3$,and $SO_2$?

  • A
    $SO_2 < P_2O_3 < SiO_2 < Al_2O_3$
  • B
    $Al_2O_3 < SiO_2 < P_2O_3 < SO_2$
  • C
    $Al_2O_3 < SiO_2 < SO_2 < P_2O_3$
  • D
    $SiO_2 < SO_2 < Al_2O_3 < P_2O_3$

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