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(A) Dehydrohalogenation in these systems often proceeds via an $E1cB$ mechanism,where the rate-determining step is the formation of a carbanion interm

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$3-$bromo$-1-$phenyl$-1,3-$butadiene

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(A) Dehydrohalogenation in these systems often proceeds via an $E1cB$ mechanism,where the rate-determining step is the formation of a carbanion intermediate.The stability of the resulting carbanion determines the ease of the reaction.In option $(A)$,the structure is $CH_2=CH-CH(Br)-CH=CH-Ph$. Upon removal of the proton at the $C3$ position,the resulting carbanion is stabilized by resonance with both the adjacent vinyl group and the phenyl ring $(Ph)$.This extensive conjugation makes the carbanion in $(A)$ the most stable among the given choices,thus making it the most reactive towards dehydrohalogenation.

Which of the following will most readily give the dehydrohalogenation product?

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