1.

• A. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{4}4s^2$
• B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{4}4s^2$
• C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{4}4s^2$
• D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{4}4s^2$

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