The correct answer is D. Hydrogen.
Helium, nitrogen, and oxygen are not inflammable gases. Hydrogen is an inflammable gas. It is a colorless, odorless, and tasteless gas that is lighter than air. It
is highly flammable and can be explosive when mixed with air. Hydrogen is used in a variety of applications, including fuel cells, balloons, and rockets.Helium is a colorless, odorless, and tasteless gas that is lighter than air. It is non-flammable and non-toxic. Helium is used in a variety of applications, including balloons, blimps, and cryogenics.
Nitrogen is a colorless, odorless, and tasteless gas that makes up about 78% of the Earth’s atmosphere. It is non-flammable and non-toxic. Nitrogen is used in a variety of applications, including fertilizers, explosives, and semiconductors.
Oxygen is a colorless, odorless, and tasteless gas that makes up about 21% of the Earth’s atmosphere. It is essential for combustion and respiration. Oxygen is used in a variety of applications, including medical supplies, welding, and rocket fuel.