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(B) $1$. The reaction starts with benzene,which undergoes Birch reduction with $Na$ in liquid $NH_3$ to form $1,4-$cyclohexadiene $(A)$.$2$. Ozonolysi

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$1,4-$pentadiene

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(B) $1$. The reaction starts with benzene,which undergoes Birch reduction with $Na$ in liquid $NH_3$ to form $1,4-$cyclohexadiene $(A)$.$2$. Ozonolysis of $1,4-$cyclohexadiene followed by reductive workup with $Zn$ yields malonaldehyde $(OHC-CH_2-CHO)$ $(B)$.$3$. The reaction of malonaldehyde with $2$ moles of Wittig reagent $(Ph_3P=CH_2)$ converts both aldehyde groups into terminal alkene groups.$4$. The final product $(C)$ is $1,4-$pentadiene $(CH_2=CH-CH_2-CH=CH_2)$.

Product $(C)$ of the above reaction is

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