ANS:C - Potassium ethyl xanthate.

The typical anionic collector used in flotation is Potassium ethyl xanthate. Explanation:

1. Ethyl dixanthogen: Ethyl dixanthogen is not an anionic collector; it is a dithiocarbamate compound commonly used as a flotation depressant for sulfide minerals.
2. Trimethyl cetyl ammonium bromide: Trimethyl cetyl ammonium bromide is a cationic surfactant and is not typically used as an anionic collector in flotation. It is often used as a collector for certain types of minerals, but it is not an anionic collector.
3. Potassium ethyl xanthate: Potassium ethyl xanthate (KEX) is a widely used anionic collector in the flotation process, particularly for sulfide minerals such as copper, lead, and zinc ores. It is effective in selectively binding to the surfaces of sulfide minerals, forming hydrophobic complexes that can be floated out of a slurry.
4. Lauryl amine hydrochloride: Lauryl amine hydrochloride is a cationic surfactant and is not typically used as an anionic collector in flotation. It may be used as a collector for certain types of minerals, but it is not an anionic collector.