Krypton
Argon
Helium
Neon
Answer is Right!
Answer is Wrong!
The correct answer is C. Helium.
Helium is used to dilute oxygen in the gas cylinders used by divers because it is less dense than air and therefore reduces the risk of decompression sickness. It is also non-flammable and non-toxic, making it a safe choice for use in diving.
Krypton, argon, and neon are all noble gases that are also non-flammable and non-toxic. However, they are all more dense than helium, which means that they would increase the risk of decompression sickness. Additionally, they are all more expensive than helium, which makes them a less cost-effective choice for use in diving.
Therefore, helium is the best choice for diluting oxygen in the gas cylinders used by divers.