Which of the following is the least stable?
- A$CH_3 - \overset{\oplus}{O} = CH - \overset{\ominus}{C}H - CH = CH_2$
- B$CH_3 - \overset{\oplus}{O} = CH - CH = CH - \overset{\ominus}{C}H_2$
- C$CH_3 - O - \overset{\oplus}{C}H - \overset{\ominus}{C}H - CH = CH_2$
- D$CH_3 - O - CH = CH - \overset{\oplus}{C}H - \overset{\ominus}{C}H_2$
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