Correct option is A
Tallow is an organic flux commonly used in soldering and brazing processes. It is a form of animal fat and serves as a lubricant and protector against oxidation during the heating process. Organic fluxes like tallow are particularly effective in promoting the wetting and flow of solder or braze onto the surfaces being joined, ensuring a strong and clean bond.
In contrast:
Hydrochloric acid, Zinc chloride, and Phosphoric acid are inorganic fluxes commonly used for different metalworking applications.
