Deck 2014: Safety

1. A incapable of supporting combustion because the hydrocarbon  vapor content makes the atmosphere below the LFL (Lower Flammable Level)
2. B capable of supporting combustion
3. C in a noncombustible state which can be relied on to occur naturally on a regular basis
4. D incapable of supporting combustion because the hydrocarbon vapor content makes the atmosphere above the UFL (Upper Flammable Limit)

Tip: press A-D to answer