We detect neutral gas in the interstellar medium by looking for radiation at 21 cm that arises when:
A) an electron moves from the n = 1 to n = 2 state in a hydrogen atom
B) an electron is ionized from a hydrogen atom
C) carbon monoxide (CO) gas is excited by stellar radiation
D) the spin of an electron flips and aligns with the spin of a proton in a hydrogen atom
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