Answer:
c. Mixtures can be separated by physical means, but compounds cannot.
Step-by-step explanation:
Mixtures are comprised of two or more pure substances that have not combined to make a new substance. Because all pure substances have their own unique properties, mixtures can be separated by physical means.
Compounds are pure substances which means they have their own properties. Compounds are formed through a chemical means, and therefore must be separated through a chemical means.