What is the correct stability order of $KO_2$, $RbO_2$, and $CsO_2$?
- A$KO_2 < RbO_2 < CsO_2$
- B$CsO_2 < KO_2 < RbO_2$
- C$CsO_2 < RbO_2 < KO_2$
- D$KO_2 > RbO_2 > CsO_2$
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