Question

01/10
what should be done to prevent trench collapses?
ignore safety protocols
use trench boxes or shields
increase the number of workers
dig deeper trenches

Explanation:

To prevent trench collapses, safety measures are necessary. Ignoring safety protocols (first option) would increase risk. Increasing workers (third) or digging deeper (fourth) don't address structural stability. Trench boxes/shields (second option) are safety devices to support trench walls and prevent collapse.

Answer:

B. Use trench boxes or shields