Answer: Option (a) is the correct answer.
Explanation:
An element is defined as the substance which cannot be broken down into simpler substances.
For example, a piece of sodium metal will contain only atoms of sodium.
Whereas a compound is a substance that contains atoms different elements which are chemically combined together in a fixed ratio by mass.
For example, sodium chloride and water ([tex]H_{2}O[/tex]) are both compounds as they both of them contain different atoms which are chemically combined.
Thus, we can conclude that 200 milliliters of water combined with sodium chloride is a mixture of two compounds.
