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# The approriate reagents for the following transformation?

$\begin{array}{1 1}(a)\;(1) HO-HO,H_3O^+,(2) NaBH_4,(3)H_3O^+\\(b)\;(1) HO-HO,H_3O^+,(2) KMnO_4,(3)H_3O^+\\(c)\;(1)RMgX,(2) H_2O,(3)KMnO_4\\(d)\;(1) LiAlH_4,(2) H_2O,(3)KMnO_4\end{array}$

Hence (a) is the correct answer.