OSHA requires that adequate protection, such as shoring, be placed in any trench that is?

The correct answer is based on OSHA regulations regarding trench safety. According to OSHA, adequate protection measures, including shoring, are required for trenches that are 5 feet or deeper. Trenches of this depth pose significant risks for cave-ins, which are a leading cause of fatalities in excavation work.

When a trench reaches 5 feet in depth, the potential for a collapse increases due to the weight of the soil. Shoring and other protective measures are vital in ensuring worker safety by preventing these hazardous collapses. Therefore, understanding this requirement is crucial for compliance with safety regulations in construction and excavation work.