The correct answer is C. Sulphur.
A polyatomic molecule is a molecule that contains more than two atoms. Sulphur is a non-metal that exists as a yellow solid at room temperature. It is the 16th most abundant element in the Earth’s crust. Sulphur is found in nature in the form of elemental sulphur, as well as in compounds such as sulphates, sulphides, and thiosulphates.
Sulphur is an important element in the chemical industry. It is used to produce sulphuric acid, which is used in a variety of products, including fertilizers, detergents, and batteries. Sulphur is also used to produce rubber, plastics, and other materials.
Sulphur is an essential element for life. It is found in proteins, nucleic acids, and other biological molecules. Sulphur is also involved in the metabolism of carbohydrates, fats, and proteins.
Argon is a noble gas that exists as a single atom. Sodium is a metal that exists as a single atom. Oxygen is a diatomic molecule that contains two oxygen atoms.
Therefore, the only option that is a polyatomic molecule is C. Sulphur.