Which of the gases make up about 99% of the air?

The correct answer is option 3. Nitrogen and oxygen.

The gases that makeup about 99% of the air are Nitrogen and oxygen.

Nitrogen makes up approximately 78% of the Earth's atmosphere.

Oxygen makes up approximately 21% of the Earth's atmosphere.

Together, nitrogen and oxygen account for about 99% of the composition of dry air. Other gases, such as argon, carbon dioxide, neon, helium, methane, krypton, hydrogen, and xenon, make up the remaining 1%.