选项
A.
A.1s2s2p3s3p3d4s4p4d4f
B.
B.1s2s2p3s3p3d4s4p4d
C.
C.1s2s2p2d3s3p3d4s4p4d
D.
D.1s2s2p3s3p4s3d4p
正确答案：