Question

which of the following are methods used to protect workers when working with trenches?
a shielding, stacking and shelving
b sloping, shoring, and shielding
c sloping, sliding and shearing
d shoring, surveying and settling

Explanation:

To protect workers in trenches, the standard methods are sloping (angling the trench walls to prevent collapse), shoring (using supports to hold walls), and shielding (using protective structures). Option A's terms (stacking, shelving) are not trench protection methods. Option C's sliding and shearing are not related. Option D's surveying and settling are not protection methods. Only Option B has the correct trio: Sloping, Shoring, and Shielding.

Answer:

B. Sloping, Shoring, and Shielding