The major product of the reaction is:

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(C) The reaction is a Friedel-Crafts alkylation of benzene with neopentyl chloride $(CH_3-C(CH_3)_2-CH_2-Cl)$ in the presence of a Lewis acid catalyst

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$1,1-$dimethyl$-2-$phenylethane

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(C) The reaction is a Friedel-Crafts alkylation of benzene with neopentyl chloride $(CH_3-C(CH_3)_2-CH_2-Cl)$ in the presence of a Lewis acid catalyst $(AlCl_3)$.$1$. The initial carbocation formed is the primary neopentyl carbocation $(CH_3-C(CH_3)_2-CH_2^+)$.$2$. Primary carbocations are unstable and undergo a $1,2-$methyl shift to form a more stable tertiary carbocation $(CH_3-C^+(CH_3)-CH_2-CH_3)$.$3$. This stable tertiary carbocation then undergoes electrophilic aromatic substitution with benzene to form the major product,which is $2-$methyl$-2-$phenylbutane (also known as tert-pentylbenzene or $1,1-$dimethyl$-2-$phenylethane structure).$4$. Looking at the options,the structure corresponding to the rearranged product is $1,1-$dimethyl$-2-$phenylethane (or $2-$methyl$-2-$phenylbutane).

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