What is the full form of NHTSA?

The correct full form of NHTSA is the National Highway Traffic Safety Administration. This agency is part of the United States Department of Transportation and is responsible for ensuring the safety of motor vehicles and road users. It develops and enforces vehicle performance standards, conducts research on traffic safety, and promotes public awareness campaigns to reduce traffic accidents and fatalities.

The other options do not accurately represent the agency's official name or its specific role in traffic safety administration. While they may seem plausible, they do not match the recognized title and scope of authority attributed to the actual federal organization responsible for highway safety. Thus, B is the accurate and formal designation of the agency.