What type of mask is included in each demo kit?

Each demo kit includes an oxygen mask, which is specifically designed for use in emergencies during a flight. Oxygen masks are crucial in situations where cabin pressure drops, as they provide supplemental oxygen to passengers and crew to help them breathe in low-oxygen environments. The inclusion of an oxygen mask in the demo kit ensures that crew members can effectively demonstrate its use to passengers, highlighting the importance of knowing how to utilize it in an emergency.

In contrast, other types of masks like gas masks or safety masks are not relevant to the operations of an airline or the needs of passengers during a flight. A face mask typically refers to items meant for hygiene or health precautions, such as during a pandemic, and does not serve the function of providing oxygen in an emergency. Thus, the presence of an oxygen mask is essential for safety training, making it the correct answer in this context.