What class or division number is assigned to flammable liquids?

• A. 2
• B. 6
• C. 9
• D. 3

Answer: (D)

Hazardous materials are organized into numbered classes, and flammable liquids are grouped as Class 3. That number tells everyone handling the material what kind of hazard it poses and what safety rules apply, including packaging, labeling, and transport requirements. In practice, flammable liquids are associated with Division 3.1 within that class, but the essential designation you need is the class number 3. The other options correspond to different hazards—gases are Class 2, toxic or infectious substances are Class 6, and miscellaneous dangerous goods are Class 9—so they don’t apply to flammable liquids.