Oxygen
Neon
Helium
Chlorine
Answer is Right!
Answer is Wrong!
The correct answer is C. Helium.
Helium is a gas that is lighter than air. It is also non-flammable, which means that it will not catch fire. This makes it ideal for use in balloons, as it will help the balloons to float.
Oxygen is a gas that is essential for human life. It is also flammable, which means that it can catch fire. This makes it unsuitable for use in balloons, as it could cause a fire hazard.
Neon is a gas that is used in neon signs. It is also non-flammable, but it is not as light as helium. This means that it is not as effective for use in balloons.
Chlorine is a gas that is used in bleach and other cleaning products. It is also flammable, which makes it unsuitable for use in balloons.
Therefore, the correct answer is C. Helium.