Which of the following pairs does not represent resonating structures?
- A$CH_3-C(=O)-CH_3$ and $CH_3-C(OH)=CH_2$
- B
- C$CH_3-C(=O^{+}-H)-CH_3$ and $CH_3-C^{+}(OH)-CH_3$
- D$CH_2=C=O$ and $C^{-}H_2-C \equiv O^{+}$
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