Respuesta :
Answer: Option (C) is the correct answer.
Explanation:
A compound is a substance that contains atoms of two or more different elements which are chemically combined together in a fixed ratio by mass.
For example, NaCl, [tex]CO_{2}[/tex], [tex]Mg(OH)_{2}[/tex] etc are all compounds.
Atoms of a compound can be separated by chemical means.
Hence, we an conclude that the atoms can only combine in fixed ratios, and they can only be separated by a chemical change, correctly describes a compound.