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An electron of H-atom de-excites form en...

An electron of H-atom de-excites form energy level `n_(1)=2` to `n_(2)=1` and the emitted photon is incident on `He^(+)` ions In ground state and first excited states. Which oof following transition is possible. (A) `n = 1` to `n = 4` (B) `n = 2 ` to `n = 4` (C) `n = 2` to `n = 3` (D) `n = 1` to `n = 3`

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