Major process(es) involved in chromatography is/are:

The correct option is D

Adsorption and partition

Chromatography separates mixtures based on difference between two phases one of which is the stationary phase with a well-developed surface area and the other is mobile phase. Adsorption and partition are two principals involved in chromatography. It is called adsorption chromatography if the stationary phase is a solid and partition chromatography if the stationary phase is a liquid.