Chromatography is a technique based on:
A. Adsorption and then dispersion of solute
B. Absorption of solute
C. Hydration of solute
D. Evaporation of solute

Hint:‌As you know that Chromatography relies on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from one another while moving with the help of a mobile phase.

Complete step by step answer:
Chromatography is the technique which is predicated on Adsorption and so dispersion of solute.
This is so because chromatography is liable for separating organic and inorganic compounds so they'll be analyzed and studied.
Adsorption refers to the collecting of molecules by the external surface or internal surface (walls of capillaries or crevices) of solids or by the surface of liquids.
Adsorption Chromatography, involves the analytical separation in its process of a chemical mixture supporting the interactivity of the adsorbate with the adsorbent. The mixture of gaseous phase or liquid phase gets separated when it passes over the adsorbent bed that adsorbs different compounds at different rates of its absorption. In chemical adsorption, gases are held to a solid surface by chemical forces that are specific for every surface and every gas.
So, the option A is the correct option.

Note:Chromatography was first developed in Russia. In lay man language it simply means colors. It is often considered in two modes which is preparative or analytical. The instrument through which we will achieve the end result is chromatograph or aerograph.It has many uses, prefer it is employed in creating vaccinations, is helpful in determining which antibodies fight various diseases and viruses, Food testing, Beverage testing, Drug testing, Forensic testing.