Which statement is true about the firefighter carry?

The statement that the firefighter carry should not be used in a smoke-filled environment is important because visibility and air quality are significantly compromised in such conditions. Smoke can obscure vision, making it difficult for a firefighter to see obstacles or navigate through an environment. Additionally, smoke can contain toxic gases that may impair a firefighter's ability to function effectively. Therefore, while the firefighter carry is an effective method for transporting individuals in many scenarios, the conditions present in a smoke-filled environment necessitate caution. Firefighters are trained to assess their surroundings and make decisions based on safety and effectiveness, and in a smoke-filled space, alternate methods might be considered to ensure both the rescuer's and the victim's safety.