Which electron configuration violates Hund's rule?
A) [He]2s2 2px2 2py2 2pz1
B) [He]2s2 2px2 2py1 2pz2
C) [He]2s2 2px1 2py2 2pz2
D) [He]2s2 2px2 2py2
E) [He]2s2 2px1 2py1 2pz2