Final answer:
WHMIS was enacted in 1988 and not in any of the given options. It is a comprehensive system for providing information on hazardous materials used in Canadian workplaces.
Step-by-step explanation:
WHMIS, which stands for Workplace Hazardous Materials Information System, first became law in 1988 through a series of complementary federal, provincial, and territorial legislation and regulations. This system was established to provide a standardized classification system for hazardous chemicals used in the workplace, requiring appropriate labeling, material safety data sheets (MSDS), and worker education and training programs. Although not one of the answer choices provided, the correct year WHMIS was enacted as law is indeed 1988. WHMIS has since been updated to incorporate the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) in order to enhance worker protection and to ensure a more uniform standard globally.