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(A) $1$. Friedel-Crafts acylation of benzene with succinic anhydride gives $4$-oxo-$4$-phenylbutanoic acid $(A)$.$2$. Reaction of $(A)$ with $SOCl_2$

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(A) $1$. Friedel-Crafts acylation of benzene with succinic anhydride gives $4$-oxo-$4$-phenylbutanoic acid $(A)$.$2$. Reaction of $(A)$ with $SOCl_2$ followed by $NaN_3$ gives the acyl azide,which undergoes Curtius rearrangement to form an isocyanate,and subsequent reaction with $MeOH$ gives a carbamate. However,the sequence implies the formation of an amine derivative. Given the final structure,the sequence leads to $3$-(methylamino)-$1$-phenylpropan-$1$-ol $(C)$ after reduction with $LiAlH_4$.$3$. The final step involves the reaction of the secondary alcohol $(C)$ with $NaH$ to form an alkoxide,which then performs a Nucleophilic Aromatic Substitution $(S_NAr)$ on $1$-chloro-$4$-(trifluoromethyl)benzene to yield the final product $(D)$.

Product $(D)$ in the above sequence is:

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