Which of These Is Not a Fundamental Postulate of Lewis

Which of these is not a fundamental postulate of Lewis theory?

A) Valence electrons are shared in covalent bonding.
B) The valence shell is involved in chemical bonding.
C) Atoms bond to achieve a more stable configuration.
D) Atoms bond to achieve an octet of electrons in the valence shell.
E) Valence electrons are shared between atoms to form ionic bonds.