The image showing the dots around the oxygen is the lewis structure of the molecule that represents the non-bonded/ unshared valence pairs of electrons. Thus, option D is correct.
What are unshared valence electrons?
Unshared valence electrons are the lone pairs that are the outer electron pairs that are not part of the covalent bonding and do not participate in the bond formation.
They can be calculated by subtracting the bonded or shared electrons from the valence electrons. As the name suggests they are lonely and are not in bond or sharing with any atoms.
They are represented by the dots around the atom, as in the water molecule the lone pairs are depicted around the oxygen atom while the remaining electrons of the oxygen are in the bond with the hydrogen atoms.
Therefore, the dots around oxygen shows the non-bonded valence electrons.
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