Which federal regulation governs the transportation of hazardous materials?

The correct choice relates to the regulation that is specifically established for the transportation of hazardous materials. The federal guidelines for this area are contained within 49 CFR Parts 100-199, which are focused on the Department of Transportation's regulations regarding hazardous materials. This code defines the requirements for packaging, handling, and transporting hazardous substances to ensure safety and compliance throughout the transportation process.

In contrast, the other options pertain to regulations outside the scope of hazardous materials transportation. 29 CFR Parts 100-199 and 29 CFR Parts 200-299 are part of the Occupational Safety and Health Administration's (OSHA) regulations, which primarily cover workplace safety standards rather than transportation issues. Thus, the focus on hazardous materials specifically aligns with the guidelines found in 49 CFR Parts 100-199, making this the appropriate regulation to reference for transportation compliance in hazardous material scenarios.