Using ¹H NMR Spectroscopy,how Can You Tell the Difference Between

Multiple Choice

Using ¹H NMR spectroscopy,how can you tell the difference between an aldehyde and a ketone?

A) An aldehyde has a C-H stretch (one or two) between 2700-2830 cm^-1.
B) An aldehyde has a proton signal between 9-10 ppm.
C) A ketone has signals around 2-3 ppm.
D) A ketone has a signal around 200 ppm.