Which of the Following Statements Is TRUE

Multiple Choice

Which of the following statements is TRUE?

A) The slow step in an S_N1 mechanism is the dissociation step, which produces a carbanion and a leaving group.
B) In an S_N1 mechanism, during the second step the nucleophile attacks the carbocation formed in the first step.
C) Primary alkylhalides are the best substrates for S_N1 reactions.
D) The hydroxyl (OH^-) group is an excellent leaving group in S_N1 reactions.
E) In an S_N1 mechanism, during the second step the nucleophile attacks the carbanion formed in the first step.