Answer:
The correct answer is: making soap.
Explanation:
Sodium hydroxide (NaOH) is an inorganic compound of great use in industries, as it is used in the manufacture of soap, detergents, papers, and textiles.
Salt is produced with Sodium chloride (NaCl), and the chemical mostly used to clean steel is Hydrochloric acid (HCl). Hydrogen is generated from fossil fuels.
