The correct option is B Preparing TNT
Use of HCl
Hydrochloric acid reacts with metals to form their respective chlorides and so, is used in the manufacture of metal chlorides.
Aqua regia is made using hydrochloric acid and nitric acid.
In manufacturing chlorine, NH4Cl, and
glucose (from corn starch).
It is also used as a laboratory reagent.
Hydrochloric acid is also used for extracting glue from bones.