1. Situational awareness during structural search and rescue includes: (453-454) A. identifying the number of severely injured occupants. B. practicing MA)'DAY and rapid intervention techniques. C. marking the building with the known number of victims inside. D. communicating starting and available air supply for yourself and your team.

The correct answer is C. marking the building with the known number of victims inside.<br /><br />Situational awareness during structural search and rescue involves being aware of the current situation and understanding the environment around you. This includes knowing the number of victims inside the building and marking the building with this information. This helps in coordinating the search and rescue efforts and ensures that all victims are accounted for.