What class of Fire is exemplified by burning paper in a lavatory trash can?

The correct answer is Class A. Class A fires involve ordinary combustibles, which include materials such as wood, paper, cloth, and many types of plastics. When paper burns in a lavatory trash can, it represents a fire fueled by these common materials, making it a clear example of a Class A fire.

In aviation safety, understanding the classifications of fires is crucial for taking appropriate action during an emergency. Class A fires are typically extinguished with water or other agents that are effective on organic materials, which is important knowledge for flight attendants in ensuring the safety of passengers and crew.