Which of the Following Statements About NMR Spectroscopy Are True

Which of the following statements about NMR spectroscopy are true? Select all that apply.

A) The area under a peak in an NMR spectrum tells us about the number of atoms experiencing the same chemical environment.
B) NMR spectroscopy can be used to tell us about any elements in a compound.
C) An NMR spectrum tells us about the different isotopes of an element that are present in a compound.
D) NMR spectroscopy exploits light in the radiofrequency region of the electromagnetic spectrum.