Answer:
C
Step-by-step explanation:
Mixtures can be separated physically, while compounds cannot.
For example if we have mixture of water and alcohol ethanol, we can separate water and ethanol with distillation (process of heating and cooling). Ethanol and water have different boiling points (physical property).
But if we want to separate water (compound) into oxygen and hydrogen, we must break bonds between oxygen and hydrogen and that is not physical property.