The OSHA standard that covers steel erection is ___ Subpart R-Steel Erection.

The correct choice aligns with the Occupational Safety and Health Administration (OSHA) standards that address safety in construction practices, specifically regarding steel erection. Subpart R, which focuses on steel erection, is part of the construction standards outlined in Title 29 of the Code of Federal Regulations, Part 1926. This part specifically deals with the regulations applicable to the construction industry, including requirements for protective measures, training, and safety protocols during the erection of steel structures.

The significance of Subpart R is to ensure the safety of workers involved in steel erection by establishing guidelines that address potential hazards, such as falls, being struck by objects, and equipment-related accidents. By adhering to these standards, employers can minimize risks and protect the health and safety of their construction workers.