The correct answer is: A. nitrogen
Nitrogen is a colorless, odorless, and tasteless gas that makes up 78% of the Earth’s atmosphere. It is a non-reactive gas, which means that it does not easily combine with other elements. This makes it an ideal gas for use in insulation and packaging.
Chlorine is a greenish-yellow gas with a strong, irritating odor. It is a highly reactive gas that is used in a variety of industrial processes, including the production of bleach and PVC.
Hydrogen is a colorless, odorless, and flammable gas. It is the lightest element in the universe and is used in a variety of applications, including rocket fuel and hydrogen fuel cells.
Oxygen is a colorless, odorless, and tasteless gas that makes up 21% of the Earth’s atmosphere. It is a highly reactive gas that is essential for life.