The correct option is C centrifugation
Centrifugation exploits the difference in the densities of the various components of a mixture. Milk is a mixture of fat, proteins, and minerals in water. All of these components have different densities. So, centrifugation can be used to separate the components.
For example, when milk is spun rapidly, the less dense cream would stay on top while the denser skimmed milk is pushed to the bottom.