What are examples of flammable substances?

Flammable substances are defined by their ability to ignite easily and burn readily when exposed to an ignition source. The correct choice highlights materials that not only have a high ease of ignition but also can sustain combustion at elevated temperatures. This means they can ignite quickly and continue to burn vigorously, posing significant safety risks in various scenarios, particularly in hazardous materials handling.

By contrast, options that reference materials with low ignition ease, those resistant to burning, or those that are non-combustible do not meet the criteria for flammability. Such materials either do not ignite easily or do not burn significantly, making them safe in terms of flammability. Understanding this distinction is vital for first responders and peace officers to effectively manage and mitigate risks associated with hazardous materials.