Final answer:
The oxygen molecule forms a double covalent bond by sharing two pairs (four) of electrons, which means six electrons are shared in total between the two oxygen atoms.
Step-by-step explanation:
The oxygen molecule (O2) is composed of two oxygen atoms, each with six electrons in its valence shell. These two oxygen atoms achieve stability by forming a double covalent bond, where they share two pairs of electrons between them. This sharing fills each oxygen atom's valence shell, bringing them to a stable state. A double covalent bond is represented in Lewis structures with two lines, indicating two pairs of shared electrons.
Therefore, the correct statement regarding the oxygen molecule's Lewis structure is: B) The two oxygen atoms are sharing six valence electrons between them.