Question

what are the three main protection methods against cave - ins? select the best option. shields, shoring, and roofing shields, shoring, and sloping frames, shoring, and sloping if you need to review this content, it can be found in the protecting workers from cave ins and utility hazards module of the excavations topic

Explanation:

In excavation - related safety, the three main methods to prevent cave - ins are shields (to protect workers), shoring (to support walls), and sloping (to reduce soil pressure). Roofing is not a main method for cave - in prevention and frames are not among the main three.

Answer:

B. Shields, shoring, and sloping