When oxygen atoms share electrons, they form covalent bonds.
What is covalent bonds?
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei.
How oxygen atom make covalent bond?
When two hydrogen atoms come close enough to an oxygen atoms, their electrons are attracted to the proton of the other atom. Because there is both a strong enough attraction between atoms and room for electrons in the outer energy levels of the atoms, they share electrons. This forms a covalent bond.
Hence, option D is correct
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