According to the selection rules, which of the following transitions is not allowed:
A) n = 3, ? = 2 to n = 2, ? = 1
B) n = 4, ? = 3 to n = 3, ? = 2
C) n = 3, ? = 1 to n = 1, ? = 0
D) n = 2, ? = 1 to n = 1, ? = 0
E) n = 4, ? = 2 to n = 3, ? = 2
E
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