Which type of ladder is included in the ground ladders carried by the truck?

The correct choice, which involves the 14 ft. roof ladder, is specifically designed for use by firefighters when accessing roofs for ventilation and other operations. Roof ladders are equipped with hooks that secure them to the edge of a roof, providing stability and safety while personnel perform tasks at height. This feature is essential in firefighting situations, allowing for secure access to a structure's rooftop.

In contrast, while the other ladder types mentioned offer their own advantages, they may not be as directly applicable to operations that require the specific functionality of a roof ladder. For instance, extension ladders are primarily used for reaching various heights but might not provide the same level of stability for roof work. An attic ladder, although useful for accessing smaller spaces, lacks the necessary features that facilitate secure roof access. Each type of ladder serves its distinct purpose based on the operational needs of the fire service, but the roof ladder is uniquely positioned for the tasks associated with roof operations.