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(B) The reaction is an intramolecular Friedel-Crafts acylation of $3-$phenylbutanoic anhydride derivative. $1$. The $AlCl_3$ acts as a Lewis acid and

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(B) The reaction is an intramolecular Friedel-Crafts acylation of $3-$phenylbutanoic anhydride derivative. $1$. The $AlCl_3$ acts as a Lewis acid and coordinates with one of the carbonyl oxygens of the anhydride. $2$. This facilitates the formation of an acylium ion intermediate. $3$. The benzene ring then attacks the electrophilic acylium carbon. $4$. Since the chain length allows for the formation of a stable six-membered ring,the cyclization occurs to form a substituted tetralone. $5$. Specifically,the product is $3$-methyl-$1$-tetralone-$3$-carboxylic acid derivative,which corresponds to the structure in option $B$.

What is the major product of the above Friedel-Crafts reaction?

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