The materials in which disordered structure of liquid is frozen are:A. Amorphous ⃝ B. Crystalline ⃝C. Polycrystalline ⃝ D. Quartz

The correct answer is A. Amorphous.

Amorphous materials are those in which the atoms or molecules are not organized in a definite lattice pattern. Instead, they have a disordered structure, similar to that of a liquid. This structure is "frozen" in place, giving the material its solid form. Examples of amorphous materials include glass, many polymers (like plastics), and even some types of metals.

On the other hand, crystalline materials have a very ordered structure, with atoms or molecules arranged in a repeating pattern extending in all three spatial dimensions. Polycrystalline materials are composed of many microscopic crystals, while quartz is a type of crystalline mineral.