Physical properties of a mixture:

Explanation

Physical properties of a mixture depend on the components that make up the mixture. Since mixtures can consist of different substances in varying proportions, the physical properties like density, boiling point, and solubility can vary based on the types and amounts of substances involved. 

For example, in a saltwater solution, the boiling point will differ depending on the concentration of salt in the water.

Other options explained:

• Vary with the amount of substance: While some properties, like mass or volume, do depend on the amount of the substance, the physical properties of the mixture primarily depend on its components.
• Depend on the volume of the substance: This is more relevant to properties like density but not to physical properties of a mixture in general.
• Depend on the organization of the substance: The organization can affect properties like crystallization, but in mixtures, the components themselves are more directly responsible for the physical properties.

Final Answer

The correct option is: Vary depending upon its components.