Simple structure, diatomic, double bond, molecule. Hence, option C is correct.
A pure substance made up of two or more different elements combined chemically in a fixed ratio is called a compound.
[tex]O_2[/tex] is a covalent molecule because each oxygen atom needs two valence electrons to complete its octet. To meet this need each oxygen atom shares two of its electrons with the other oxygen forming a strong oxygen-oxygen double-shared covalent bond.
Hence, option C is correct.
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