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------------------------------------------------ Put the following energy sublevels in order from least to greatest energy.

A. None of these

B. 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f

C. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d

D. 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d