A) $ O_2 $
B) $ H_2O $
C) $ {O^{-}} $
D) $ {O^{2-}} $
Correct Answer: D
$ O{H^{-}}\to \underset{Conjugate,base,of,O{H^{-}}}{\mathop{{O^{2-}}+{H^{+}}}}, $
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