Which of the following is arranged in decreasing order of size?
- A$Mg^{2+} > Al^{3+} > O^{2-}$
- B$O^{2-} > Mg^{2+} > Al^{3+}$
- C$Al^{3+} > Mg^{2+} > O^{2-}$
- D$Al^{3+} > O^{2-} > Mg^{2+}$
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