Answer:
B, Single Covalent bonds do not give all of the atoms in the molecule eight valence electrons.
Explanation:
In most cases, this is the reason why atoms form multiple covalent bonds. A prominent example would be [tex]N_{3}[/tex]. Nitrogen has 5 valence electrons each, meaning it needs 3 more electrons to fill its outer shell. Nitrogen can fill its outer shell by simply forming 3 covalent bonds with another Nitrogen atom.