The product obtained in the reaction is:

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(A) The reaction involves the nucleophilic attack of the Grignard reagent $RMgX$ on the less hindered carbon atom of the epoxide ring.In the given epo

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$R-CH_2-C(R')(R'')-OH$

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(A) The reaction involves the nucleophilic attack of the Grignard reagent $RMgX$ on the less hindered carbon atom of the epoxide ring.In the given epoxide,the carbon atom with $R'$ and $R''$ substituents is more sterically hindered.Therefore,the nucleophile $R^-$ attacks the less substituted carbon atom (the $CH_2$ group).This leads to the ring opening,followed by protonation with $H_2O$ to form the primary alcohol: $R-CH_2-C(R')(R'')-OH$.

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