12. Which of these could be resolved into separate enantiomers?
(A) 4-Methyl-1-pentanamine
(B) 4-Methyl-2-pentanamine
(C) $N$-Methyl-1-butanamine
(D) $N,N$-Dimethyl-1-propanamine
(E) $N$-Butyltrimethylammonium bromide

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