A balloon light is usually filled with air or helium; which gas option is listed as a possibility in that context?

• A. Air or Helium
• B. Helium only
• C. Air only
• D. Hydrogen

Answer: (A)

Balloon lights rely on a gas that fills the balloon to provide lift or containment. In typical practice, they can be filled with air or helium, with air being readily available and helium offering additional buoyancy while remaining nonflammable. Hydrogen is avoided because it is highly flammable. Since the context lists both air and helium as possible fillings, the correct choice is that the gas option is Air or Helium.