Which statement is true about the OC spray propellant?

• A. It must be ozone safe, non-toxic, and non-carcinogenic.
• B. It must be highly toxic to be effective.
• C. It must be a heavy liquid at use temperature.
• D. It must be a solid at room temperature.

Answer: (A)

The key idea is safety and environmental compatibility. The propellant in OC spray is there to push the irritant out of the can and create a usable spray, so it should not add health risks or environmental harm. That’s why the statement that it must be ozone safe, non-toxic, and non-carcinogenic is the best fit: it ensures that, beyond the OC irritant itself, there’s no additional hazard to the user, bystanders, or the environment, including the ozone layer.

Being highly toxic would defeat the safety purpose, as the propellant could cause harm independent of the OC irritant. Being a heavy liquid at use temperature isn’t a defining requirement for a propellant and isn’t how most canister propellants behave, since many rely on gases or low-boiling liquids to expel the contents. Being solid at room temperature would make it unusable as a propellant.