Which of the following protects against cave-ins? A. All answer choices protect against cave-ins B. Shielding C. Shoring D. Sloping

 A. All answer choices protect against cave-ins. In the context of trenching and excavation in construction or mining, shielding, shoring, and sloping are three methods used to enhance safety and protect workers from cave-ins.

- Shielding involves the use of trench boxes or other types of supports to provide a barrier between the workers and the walls of the excavation. These shields are designed to withstand the forces of a cave-in and protect the workers within the shielded area

Shoring involves installing aluminum hydraulics or other types of supports to prevent soil movement and cave-ins. Shoring systems can be adjustable and are used to support the walls of the trench to prevent collapse. - Sloping is the practice of cutting the trench wall at an angle inclined away from the excavation. This angle is designed to prevent soil from falling into the trench by reducing the risk of a cave-in.

Each of these methods can be effective in different situations, depending on soil conditions and the depth and size of the trench. Safety regulations typically dictate which method should be used based on the specific circumstances of the excavation work.