What may categorically be defined as hazardous?

Defining a substance as hazardous generally encompasses a broad range of materials that can pose a risk to human health or the environment. The correct choice, which encompasses substances that can cause injury or death, captures the essence of what makes a substance hazardous. This definition is inclusive of varying categories of hazardous materials, including but not limited to toxic, explosive, and flammable substances.

Toxic materials are indeed hazardous due to their potential to cause harm if ingested, inhaled, or come into contact with skin. Similarly, explosive materials can cause catastrophic incidents, posing a danger to life, property, and the environment. Flammable substances pose fire risks that can lead to dangerous situations as well. However, the definition of hazardous extends beyond these categories to include any material or substance that can significantly harm individuals or the environment, including chemical, biological, and radioactive agents, which fall under the broader definition.

Thus, substances that can cause injury or death represent a comprehensive approach to understanding hazards, as they encapsulate various forms of risks associated with numerous types of substances. This broader classification ensures that safety measures and regulations can effectively address the many threats present in various contexts.