3. Rank the following species in order of increasing nucleophilicity: (A) CH3CH2S- ＜ CH3CH2O- ＜ (CH3)3CO- ＜ (CH3)3COH (B) (CH3)3COH ＜ CH3CH2O- ＜ (CH3)3CO- ＜ CH3CH2S- (C) (CH3)3COH ＜ CH3CH2S- ＜ (CH3)3CO- ＜ CH3CH2O- (D) (CH3)3COH ＜ CH3CH2S- ＜ CH3CH2O- ＜ (CH3)3CO- (E) (CH3)3COH ＜ (CH3)3CO- ＜ CH3CH2O- ＜ CH3CH2S-