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(B) The reaction sequence is as follows:$1$. Benzene reacts with succinic anhydride in the presence of $AlCl_3$ (Friedel-Crafts acylation) to form $4-

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(B) The reaction sequence is as follows:$1$. Benzene reacts with succinic anhydride in the presence of $AlCl_3$ (Friedel-Crafts acylation) to form $4-$oxo$-4-$phenylbutanoic acid $(A)$.$2$. Clemmensen reduction of $(A)$ using $Zn(Hg)/HCl$ reduces the keto group to a methylene group,yielding $4-$phenylbutanoic acid $(B)$.$3$. Intramolecular Friedel-Crafts acylation of $(B)$ using $H_3PO_4$ (or $P_2O_5$) leads to the formation of $\alpha$-tetralone ($1$-tetralone) as product $(C)$.

Product $(C)$ of the above reaction is

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