What is the product (B) of the following reac | vedclass

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(A) $1$. The reaction of $sec$-butyl bromide with $Mg$ in $Et_2O$ forms the Grignard reagent $A$,which is $sec$-butylmagnesium bromide $(CH_3CH_2CH(CH

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(A) $1$. The reaction of $sec$-butyl bromide with $Mg$ in $Et_2O$ forms the Grignard reagent $A$,which is $sec$-butylmagnesium bromide $(CH_3CH_2CH(CH_3)MgBr)$.$2$. The Grignard reagent acts as a strong nucleophile and attacks the epoxide ring.$3$. In the presence of a basic medium (Grignard reagent),the nucleophilic attack occurs at the less sterically hindered carbon atom of the epoxide.$4$. The $sec$-butyl group attacks the less substituted carbon of the $1-$methyl$-1,2-$epoxycyclopentane ring.$5$. Subsequent acid workup with $H_3O^+$ protonates the resulting alkoxide to form the final alcohol product $(B)$.$6$. Based on the stereochemistry and regioselectivity,the product is the one shown in option $A$.

What is the product $(B)$ of the following reaction sequence?

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