The product of the reaction is:

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(B) The reaction involves the nucleophilic attack of the Grignard reagent $ClMg(CH_2)_4MgCl$ on the carbonyl group of the cyclic ester (lactone),$\gam

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(B) The reaction involves the nucleophilic attack of the Grignard reagent $ClMg(CH_2)_4MgCl$ on the carbonyl group of the cyclic ester (lactone),$\gamma$-butyrolactone.$1$. The Grignard reagent acts as a nucleophile,attacking the carbonyl carbon of the lactone.$2$. The ring opens,and after acidic workup $(H_3O^+)$,the product formed is a diol.$3$. Specifically,the reaction of $\gamma$-butyrolactone with a bifunctional Grignard reagent like $ClMg(CH_2)_4MgCl$ leads to the formation of a diol where the chain is extended.$4$. The structure corresponding to the product is a cyclopentane ring substituted with a hydroxy group and a hydroxypropyl chain,which matches the structure shown in option $B$.

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