Which of the following is considered a hazardous material?

Biological agents are classified as hazardous materials because they can pose significant risks to human health and the environment. These agents, which include bacteria, viruses, fungi, and toxins, can cause disease, injury, or harm due to their infectious or toxic properties. The classification as hazardous material means that special precautions must be taken when handling, storing, or transporting these substances to prevent accidents and exposure.

In contrast, options such as water, household cleaners, and sand do not typically meet the criteria for hazardous materials in the same way. Water, while necessary for life, is not harmful in itself unless contaminated. Household cleaners may have hazardous components, but many are designed to be safe when used as directed and are often not classified as hazardous materials in their consumer form. Sand is a natural substance and does not possess the inherent risks associated with chemical or biological hazards.