Which option correctly matches a hazard class with an example?

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Hazard classification groups materials by their primary danger during transport, and using a familiar example helps lock in the category. Explosives form Class 1 because they release energy rapidly and produce shock, heat, and a blast. TNT is the classic example of an explosive, so pairing explosives with TNT correctly demonstrates this class.

The other pairings don’t fit as well: water is a liquid, not a gas, so it wouldn’t illustrate the gas hazard class. A true gas example would be something like chlorine or oxygen in gaseous form. Beer is a beverage with low flammability and isn’t used as the standard example of a flammable liquid in hazmat classifications (which would use substances like gasoline or acetone). Mercury is a metal and not radioactive, so it wouldn’t illustrate the radioactive materials class (which would involve true radioactive substances).