The correct answer is B. Bromine.
An inert gas is a gas that is chemically unreactive. They are also known as noble gases. Helium, argon, neon, krypton, xenon, and radon are the six noble gases. They are all colorless, odorless, and tasteless gases that are monatomic (meaning they consist of single atoms). They are also very stable and do not react with other elements.
Bromine is a chemical element with the symbol Br and atomic number 35. It is the third member of the halogen group and is a highly reactive, corrosive, and flammable pale red-brown liquid at standard temperature and pressure. Bromine occurs naturally in small quantities, combined with other elements in minerals. It is produced commercially as a byproduct of the electrolysis of brine.
Bromine is used in a variety of industrial applications, including the production of bromine-containing compounds, such as bromides, bromates, and hypobromites. It is also used in the production of flame retardants, dyes, and pharmaceuticals. Bromine is a toxic substance and can be harmful to human health if inhaled or ingested.