The DOT hazard class 2 includes:

The DOT hazard class 2 includes:

• A. Nonflammable gases
• B. Flammable liquids
• C. Radiological materials
• D. Toxic substances

Answer: (A)

Class 2 is the DOT hazard class for gases, and it includes divisions based on how the gas behaves: flammable gases, nonflammable gases, and toxic gases. The correct choice fits because nonflammable gases are indeed one of the subdivisions within Class 2, meaning gases that do not ignite or burn under normal conditions but still pose hazards such as asphyxiation or pressure hazards in enclosed spaces. The other options point to hazards in different classes: flammable liquids belong to Class 3, radiological materials to Class 7, and toxic substances to Class 6. (Note: toxic gases specifically are still Class 2, but toxic substances in general, especially non-gaseous forms, fall under Class 6.)

Class 2 is the DOT hazard class for gases, and it includes divisions based on how the gas behaves: flammable gases, nonflammable gases, and toxic gases. The correct choice fits because nonflammable gases are indeed one of the subdivisions within Class 2, meaning gases that do not ignite or burn under normal conditions but still pose hazards such as asphyxiation or pressure hazards in enclosed spaces.

The other options point to hazards in different classes: flammable liquids belong to Class 3, radiological materials to Class 7, and toxic substances to Class 6. (Note: toxic gases specifically are still Class 2, but toxic substances in general, especially non-gaseous forms, fall under Class 6.)