How are chemicals classified in the Globally Harmonized System (GHS)?

The correct choice emphasizes that the Globally Harmonized System (GHS) classifies chemicals based on their physical hazards, health hazards, and environmental hazards. This classification is crucial for the accurate and consistent communication of hazards associated with chemical substances. Under GHS, chemicals are assessed and labeled to provide essential safety information, which includes hazard pictograms, signal words, and precautionary statements that inform users about the risks involved with handling and using those chemicals.

Other classification criteria, such as storage requirements, volatility, reactivity, or temperature sensitivity, do not align with the core principles of the GHS framework, which is primarily focused on the inherent dangers posed by the chemicals themselves rather than their conditions of use or external handling parameters. Therefore, option B encapsulates the fundamental purpose of GHS in promoting global safety and awareness of chemical hazards.