Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) The S_N2 mechanism does not have any intermediates and has only one transition state.
B) Tertiary alkylchlorides are the best substrates for S_N2 reactions.
C) Only the strength of the nucleophile is important for S_N2 reactions, not the nature of the leaving group.
D) S_N1 reactions have a carbanion as an intermediate.
E) S_N2 reactions result in the racemic product if we start from one enantiomer of a chiral substrate.