9. Which one of the following SN2 reactions will take place at the fastest rate, assuming that concentrations of reactants are the same in all cases? A) Na+ CN– + CH3CH2-OH –––> CH3CH2-CN + Na+ OH– B) Na+ CN– + CH3CH2-OCH3 –––> CH3CH2-CN + Na+ OCH3 – C) Na+ CN– + CH3CH2-OC(CH3)3 –––> CH3CH2-CN + Na+ OC(CH3)3 – D) Na+ CN– + CH3CH2-Br –––> CH3CH2-CN + Na+ Br– E) Na+ CN– + CH3CH2-NH2 –––> CH3CH2-CN + Na+ NH2