A \( 1s^2 2s^2 2p^6 3s^2 3p^6 3d^4 4s^2 \)
B \( 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^2 \)
C \( 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^1 \)
D \( 1s^2 2s^2 2p^6 3s^2 3p^6 3d^4 4s^1 \)
Correct Answer: Option C
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