9. What is the selection rule for particle-in-one-dimension-box?
(A) \( \Delta S = 0 \)
(B) \( \Delta J = 0, \pm 1 \)
(C)\( \Delta V = \pm 1 \)
(D)\( \Delta n = \pm 1, \pm 3, \pm 5, \dots \)

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