What classes of fires should the cabin crew be aware of?

The correct answer encompasses the full range of fire classes that cabin crew needs to be aware of while on duty.

Class A fires involve ordinary combustibles like wood, paper, and textiles. Class B fires are related to flammable liquids and gases, such as oil and gasoline. Class C fires involve energized electrical equipment. Class D fires are associated with combustible metals, like magnesium or titanium, which require specialized extinguishing methods. Lastly, Class K fires pertain to cooking oils and fats, commonly found in commercial kitchens.

Understanding these classifications allows cabin crew to identify the nature of a fire and respond appropriately with the correct type of fire extinguisher and suppression method, ensuring passenger safety and effective emergency response.

The other options either omit certain classes that are crucial for proper fire response or include categories that aren't standard classifications used in fire safety protocols relevant to the plane’s environment.