The correct answer is: C. Argon
Argon is the most abundant inert gas in the Earth’s atmosphere, making up about 0.93% of the air. It is
a colorless, odorless, and tasteless gas that is slightly heavier than air. Argon is used in a variety of applications, including lighting, welding, and cryogenics.Helium is the second most abundant inert gas in the Earth’s atmosphere, making up about 0.0005% of the air. It is a colorless, odorless, and tasteless gas that is lighter than air. Helium is used in a variety of applications, including balloons, cryogenics, and nuclear reactors.
Neon is the third
most abundant inert gas in the Earth’s atmosphere, making up about 0.0018% of the air. It is a colorless, odorless, and tasteless gas that is slightly heavier than air. Neon is used in a variety of applications, including lighting, lasers, and signs.Krypton is the fourth most abundant inert gas in the Earth’s atmosphere, making up about 0.0001% of the air. It is a colorless, odorless, and tasteless gas that is slightly heavier than air. Krypton is used in a variety of applications, including lighting, lasers, and signs.