The correct answer is d. element, molecule, pure substance.
- Element: Oxygen (O) is an element, and O₂ is a diatomic molecule of that element.
- Molecule: O₂ is a molecule because it consists of two atoms of oxygen bonded together.
- Pure substance: O₂ is considered a pure substance since it has a uniform composition throughout.
The other options do not accurately describe oxygen gas specifically.
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