The correct answer is C. Helium.
Noble gases are elements in group 18 of the periodic table. They are very stable and do not react with other elements. They are also called inert gases or rare gases.
Hydrogen is a gas that is found in the Earth’s atmosphere. It is the lightest element in the universe. Hydrogen is a flammable gas and can be used to create energy.
Oxygen is a gas that is found in the Earth’s atmosphere. It is necessary for life. Oxygen is a colorless, odorless gas that is essential for combustion.
Carbon dioxide is a gas that is found in the Earth’s atmosphere. It is a greenhouse gas and can contribute to climate change. Carbon dioxide is a colorless, odorless gas that is produced when fossil fuels are burned.