After heavy rain, an excavation resumes without a competent person examining soil, water, access, and protective systems. What safety step was required?

Why C is correct

The best answer is: At required intervals and after events that could increase hazards. Rain, vibration, loading, utilities, and changing soil can rapidly alter trench safety. Required inspections and prompt correction must track actual conditions. The new fact pattern changes the setting, not the governing rule or management control. The other choices either skip a required step, apply a different rule, or fail to address the stated risk.