A Class B fire is most commonly caused by which of the following?

A Class B fire is primarily associated with flammable liquids and gases, including cooking oils and greases. This category of fire is particularly significant in environments such as kitchens and restaurants where fats and oils are frequently used in food preparation. The reason why cooking oils and grease are the most common causes of Class B fires is due to their ability to ignite quickly and produce intense flames when they come in contact with high heat or open flames.

Class B fires are different from other classes, which involve other materials. For example, electrical malfunctions can lead to Class C fires, which involve energized electrical equipment. Similarly, combustible materials like wood and paper products are associated with Class A fires. Understanding these classifications helps in effective fire prevention and response strategies. Being aware of the specific materials that can ignite in each class allows individuals to take appropriate safety measures in their environments.