The U.S. Department of Transportation's definition of hazardous materials specifies three entities against which a hazardous material poses an unreasonable risk. Which of the following is one of these entities?

The definition provided by the U.S. Department of Transportation emphasizes that hazardous materials can pose unreasonable risks to various entities, and one of these key entities is the environment. This reflects the understanding that hazardous materials, if not managed properly, can lead to severe environmental damage, such as contamination of air, water, and soil. This risk is significant because it can affect ecosystems, wildlife, and human health over time.

While drivers and handlers, as well as receivers and shippers, certainly face risks associated with hazardous materials, the environment stands out as a critical entity because the impact on it can have widespread, lasting consequences that extend beyond individual safety.