What does a Mayday signal indicate?

The Mayday signal is a critical communication tool used in emergency situations, specifically designed to alert other firefighters that an individual is in grave danger of serious injury or death. When a firefighter calls a Mayday, it signifies an immediate and life-threatening situation, such as becoming trapped, lost, or incapacitated. This signal prompts an urgent response from other team members to assist and rescue the person in distress, emphasizing the gravity of the situation and the necessity for quick action.

In the context of fire response, recognizing and responding to a Mayday call can be the difference between life and death. The use of this specific signal helps ensure that all team members prioritize their colleague's safety and act swiftly to mitigate the risk.

Other options describe different situations but do not capture the essence of the Mayday signal's life-threatening implications, which is why option B is the most accurate choice.