Final answer:
A container labeled with a hazard classification of "4" within the UN/DOT system contains a (c) Flammable Solid, which is known for its high level of flammability and reactivity, indicating that it may detonate. Option c.
Step-by-step explanation:
Within the UN/DOT hazard classification system, a container labeled with a hazard classification of "4" signifies a substance that may detonate, which points to a high level of hazard in terms of flammability and reactivity. The correct answer to what a hazard classification of "4" contains is: (c) Flammable Solid. This classification fits within the broader context of hazardous materials, which are marked based on their main characteristics: ignitability, corrosivity, reactivity, and toxicity. Among the options given, flammable solids are most likely to be associated with the risk level denoted by a "4" classification.
Within the UN/DOT system, a container labeled with a hazard classification of "4" indicates that it is extremely hazardous in terms of fire. The hazard classifications under the UN/DOT system are rated on a scale from 0 to 4. A hazard classification of "4" signifies a substance that may detonate or undergo a violent chemical change.