What device is specifically designed to grasp the rope in a Mechanical Advantage system?

The correct answer is the device known as cams, which are specifically designed to grasp the rope and create a mechanical advantage in rescue scenarios. Cams work by utilizing a mechanical grip that engages when the rope is pulled in one direction, allowing them to hold securely while enabling movement in the opposite direction. This unique function is essential in rescue operations, as it helps manage tension and provide stability during the lifting or lowering of a rescuer or victim.

In contrast, an ascender is primarily used to climb up a rope rather than to create mechanical advantage. It allows the user to ascend, but does not provide the same gripping functionality as cams when under load. Carabiners serve as connectors in a system and do not grasp rope; instead, they facilitate the joining of various components, while harnesses serve a different purpose by securing personnel and distributing load but do not interact with the rope in the mechanical advantage context. Thus, cams are the most appropriate choice for the function of grasping the rope in a mechanical advantage system.