Which signal word must appear on a GHS Label?

The correct answer is associated with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS). Under GHS, specific signal words are required on labels to indicate the level of hazard associated with a chemical. The signal word "Warning" is used for products that present a moderate hazard, while "Danger" is typically reserved for more severe hazards.

In terms of standardized communication about hazards, "Warning" effectively communicates that there are potential risks that should be approached with caution, ensuring that users can quickly assess the dangers involved and take appropriate safety measures. Other terms like "Alert," "Caution," or "Info" do not fulfill the GHS labeling requirements, as they lack the precise recognition and standardized understanding needed in hazardous communication. Therefore, "Warning" is the essential term to convey relevant safety information effectively.