What type of stretcher features surrounding guards like a boat?

The correct answer is the basket stretcher, which is specifically designed with a frame and surrounding guards that resemble the sides of a boat. This design allows for safe transport of patients, especially in difficult terrains or when there is a risk of falling out during movement. The basket stretcher can effectively secure a patient and provide support, making it ideal for situations such as rescue operations in mountainous or rugged environments.

In contrast, wheeled stretchers typically have wheels for easy transport on flat surfaces, but they do not have the enclosed design of a basket stretcher. Stair chairs are specifically designed for safely moving patients up and down stairs and lack any surrounding guards. Flexible stretchers, while compact and easy to carry, do not provide the same level of support and protection provided by the sides of a basket stretcher. Thus, the unique construction of the basket stretcher makes it the appropriate choice in this context.