Which Nucleophilic Substitution Reaction Would Be Unlikely to Occur?
A)HO^- $\to$

Which nucleophilic substitution reaction would be unlikely to occur?

A) HO^- + CH₃CH₂-I $\to$ CH₃CH₂-OH + I^-
B) I^- + CH₃CH₂-H $\to$ CH₃CH₂-I + H^-
C) CH₃S^- + CH₃-Br $\to$ CH₃S-CH₃ + Br^-
D) All of these choices would be unlikely to occur.
E) None of these choices would be unlikely to occur.