Among the oxides $SiO_2, SO_2, Al_2O_3$ and $P_2O_3$,the correct order of acidic strength is
- A$SiO_2 < SO_2 < Al_2O_3 < P_2O_3$
- B$SO_2 < P_2O_3 < Al_2O_3 < SiO_2$
- C$Al_2O_3 < SiO_2 < P_2O_3 < SO_2$
- D$Al_2O_3 < P_2O_3 < SiO_2 < SO_2$
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