Milk is an example of:

Correct answers: (b) A colloidal solution or (c) An emulsion

Explanation

Milk is a colloid: tiny droplets of fat are spread through water, along with dispersed proteins. A colloid of one liquid dispersed in another liquid is an emulsion.

So milk is both an emulsion and a colloidal solution (an emulsion is a type of colloid), and both (b) and (c) are correct. If one must be chosen, emulsion is the more exact description.