Problem: The existence of discrete (quantized) energy levels in an atom may be inferred from (A) experiments on the photoelectric effect.(B) diffraction of electrons by crystals.(C) X-ray diffraction by crystals(D) atomic line spectra

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The existence of discrete (quantized) energy levels in an atom may be inferred from 

(A) experiments on the photoelectric effect.

(B) diffraction of electrons by crystals.

(C) X-ray diffraction by crystals

(D) atomic line spectra