Cyclohex-2-en-1-one is converted to 2,3-epoxycyclohexan-1-one by conjugate addition of a peroxide anion followed by ring closure. The reagent used is

ANa in liquid $NH X_{3}$
B $Pb (OAc) X_{4}$ in acetic acid
C $HIO X_{4}$
D $H X_{2} O X_{2}$ with aqueous $NaOH$

Answer: D

The C=C of an enone is electron-poor, so it reacts with a nucleophilic oxidant. The hydroperoxide anion adds to the beta carbon (Weitz-Scheffer reaction) and the resulting enolate displaces hydroxide intramolecularly to give the epoxide. The other reagents do not do this.

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