A. 1s 2p 2s 3p 3s 3d 4s
B. 1s 2s 2p 3s 3p 3d 4s
C. 1s 2s 2p 3s 3p 4s 3d
D. 1s 2s 3s 2p 3p 4s 3d

Correct Answer: Option C

B. 1s 2s 2p 3s 3p 3d 4s

Copyright warnings! Do not copy.