Water is an inorganic substance made of oxygen and hydrogen atoms. Water can be said as a compound, molecule, and pure substance. Thus, option D is correct.
What is a pure substance?
In chemistry, a pure substance is defined to be a substance that has distinct chemical characteristics and is known to have a constant and definite composition of matter all over.
A compound is a substance that is made of two or more elements joined chemically, while a molecule is the unit of the compound comprising of the atoms bonded by the forces.
Water is a pure substance as it has a definite composition, it is a compound and a molecule as it is made of two hydrogens and one oxygen atom that are linked through an attractive force.
Therefore, option D. a water molecule is a compound, molecule, and pure substance.
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