A three-carbon, nitrogen-containing compound exhibits 3 ¹³C NMR peaks (d 11.2, 27.3, and 44.9) . Which of the following compounds best matches this spectral data?

A) H₂NCH₂CH₂CH₂OH
B) (CH₃) ₂CHNH₂
C) CH₃NHCH₂CH₃
D) CH₃CH₂CH₂NH₂
E) CH₃CH₂C≡N

The NMR peaks indicate that there are three different types of carbon environments in the molecule. The peak at d 44.9 indicates the presence of a carbon next to a nitrogen atom, which is consistent with the structure of choice D. The other peaks at d 27.3 and 11.2 are likely due to different types of carbon-hydrogen environments in the molecule. Choices A, B, C, and E do not have a nitrogen-bound carbon or have more than three carbons.