一道关于分子轨道的英文题

一道关于分子轨道的英文题
What is the most important extra step that has to be included in the first approach technique for assigning electrons in a heteronuclear diatomic molecule?
A Account for the effect of anti-bonding electron orbitals.
B Account for any hybridization effects.
C Account for the orbital energy differences between the two atoms.
D Account for the electronegativity (and orbital energy) differences between the two atoms.

I believe D is the correct answer.You've got to know the electronegativity difference first,then you can figure out which atom is partially positive and which is partially negative.The partial negative atom has greater attraction on electrons