Final answer:
WHMIS class C includes oxidizing materials, which are chemicals that may cause or enhance combustion in other materials by releasing oxygen. An example is potassium dichromate.
Step-by-step explanation:
The WHMIS (Workplace Hazardous Materials Information System) class C refers to oxidizing materials. Oxidizing materials are chemicals that can release oxygen, which may cause or intensify a fire or cause other materials to combust. An example of an oxidizing material is potassium dichromate. These materials don't necessarily combust themselves, but they can cause or contribute to the combustion of other materials due to the release of oxygen.
Oxidizing materials are part of a broader group of hazardous wastes, which can include toxic, flammable, reactive, and corrosive substances. Flammable materials, such as wastes with flash points below 60 °C, ignitable gases and certain non-liquids that cause fire through specific conditions, are characteristic of other types of hazardous wastes and should be handled with care to avoid ignition and injury.