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Atomic }Radiation Spectra
Choice-by-choice analysis gives...
(A) The word nuclear sounds questionable, as lines are often due to just spin-splitting.
(B) The wavelengths of absorption spectra are often close to that of emissions spectrum (or overlapping). This is true.
(C) Absorption spectra is often used in astrophysics to determine the contents of stars. Even though mere mostly harmless Earthlings have never visited the sun, the absorption spectra of the sun helps determine its component elements.
(D) Same idea as in the previous choice.
(E) A single atom does not have band spectra. So, yes, band-spectra are due to molecules. (To wit: it only has, say, 2s, 3p, etc., states, and not states that are split in-between---molecules have more degrees of freedom, i.e., they can rotate and vibrate, while atoms can't.)
The remaining choice is (A). Take that.
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