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(C) The correct option is $C$. The transformation involves the conversion of $4$-oxo-$4$-phenylbutanoic acid to $\alpha$-tetralone. The steps are as f

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$i$. $Zn(Hg)/HCl$; $ii$. $SOCl_2$; $iii$. anhyd. $AlCl_3$

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(C) The correct option is $C$. The transformation involves the conversion of $4$-oxo-$4$-phenylbutanoic acid to $\alpha$-tetralone. The steps are as follows:$i$. $Zn(Hg)/HCl$ (Clemmensen reduction): Reduces the ketone group to a methylene group $(-CH_2-)$.$ii$. $SOCl_2$: Converts the carboxylic acid group $(-COOH)$ to an acid chloride $(-COCl)$.$iii$. Anhydrous $AlCl_3$ (Friedel-Crafts acylation): Facilitates intramolecular cyclization to form the cyclic ketone ($\alpha$-tetralone).

The following transformation can be carried out in three steps. The reagents required for these three steps in their correct order are:

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