Which of the following defines a Hazard Label?

A hazard label serves as a specific identification of hazardous risks, providing essential information to emergency responders and others about the nature of the hazard involved. It includes symbols, colors, and text designed to convey critical information about the potential dangers associated with the materials it identifies. This clarity is crucial for ensuring appropriate handling, storage, and emergency response procedures.

The other options do not encapsulate the primary function of a hazard label. While a warning sign for general risks may indicate that caution is needed, it doesn't specifically address the hazardous nature of materials. A description of all materials on board would encompass a broader inventory but lack the focus required to convey certain risks associated with specific materials. A guideline for safe materials might provide safety protocols, but it wouldn't define the hazards themselves. Thus, option C accurately captures the essence of what a hazard label is intended to communicate.