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

Explanation:

In construction - related safety for preventing cave - ins, shields (physical barriers), shoring (support structures), and sloping (angling the excavation walls) are common methods. Roofing is not a main method for cave - in prevention, and frames are not among the main three.

Answer:

B. Shields, shoring, and sloping