Hazard warning labels must include:

The correct answer is that hazard warning labels must include signal words and pictograms. Signal words such as "Warning" or "Danger" provide immediate recognition of the level of hazard associated with the chemical, allowing individuals to quickly assess the risks. Pictograms enhance this by using standard visual symbols that convey specific hazards, such as toxicity, flammability, or corrosiveness. This combination of signal words and pictograms supports effective communication about chemical hazards, ensuring that workers and responders can make informed decisions to protect their health and safety.

The other options do not contribute to the fundamental purpose of hazard warning labels. The average national price for the chemical does not pertain to safety information, nor does it support hazard identification. Similarly, lists of stores that sell the chemical and names of hospitals near the manufacturer are irrelevant as they do not provide essential risk information necessary for safe handling and emergency response. The focus of hazard labels is strictly on the hazards presented by the chemical, ensuring clear, relevant, and standardized communication regarding safety.