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(B) The starting material is $3$-benzoylpropanenitrile. It contains both a ketone and a nitrile functional group. When treated with excess $CH_3MgBr$,

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(B) The starting material is $3$-benzoylpropanenitrile. It contains both a ketone and a nitrile functional group. When treated with excess $CH_3MgBr$,the Grignard reagent attacks both the carbonyl carbon of the ketone and the carbon of the nitrile group. $1$. The ketone group reacts with one equivalent of $CH_3MgBr$ to form a tertiary alcohol after workup. $2$. The nitrile group reacts with another equivalent of $CH_3MgBr$ to form an imine intermediate,which upon hydrolysis $(H_3O^+)$ yields a ketone. Therefore,the final product is $5$-hydroxy-$5$-phenylhexan-$2$-one.

The major product of the following reaction is

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