Which of the following tools is commonly used to stabilize a collapsed structure?

Shore or strut systems are commonly used to stabilize a collapsed structure because they provide critical support to prevent further movement and collapse. These systems are designed to redistribute weight and provide structural integrity during rescue operations. By installing shores or struts, rescuers can create a safe environment to operate in while facilitating searches for victims and ensuring that responders are protected from additional hazards posed by the instability of the structure.

The other options, while useful in specific contexts, do not focus primarily on stabilization. Cranes and hoists may assist in lifting or moving debris but do not provide the necessary support to stabilize a structure directly. Excavators and bulldozers are generally used for demolition or debris removal rather than stabilization, as their heavy machinery can further jeopardize the stability of a compromised structure. Hand tools are valuable for specific tasks but are insufficient for the structural requirements needed in a collapse scenario, where larger, supportive systems like shores and struts are essential for safety and stability.