Froth floatation process is based on:

The Froth floatation process is based on the wetting properties of the ore particles.

The wetting characteristics of the ore particles form the foundation of the froth flotation process, which is important to keep in mind. It is only possible to purify metallic sulphide ore in its wet condition through the froth flotation process. Due to water gangue and oil, metallic sulphide ore is moist.

Hence, option C is correct.