When did Congress transfer hazardous material transport responsibility to PHMSA?

The correct answer is February 2005. This is significant as it marks the date when the Pipeline and Hazardous Materials Safety Administration (PHMSA) took over the responsibilities of regulating the transportation of hazardous materials. This transfer aimed to improve safety standards and government oversight regarding hazardous material transport, streamlining the regulations under a dedicated agency focused on safety.

This change was influenced by the need for a more organized and efficient approach to handling hazardous materials, reflecting Congress's recognition of the complexities and risks involved in transporting such materials. PHMSA was established to specifically address these issues, ensuring that proper guidelines and safety measures were in place to protect public health and the environment.

The other choices represent months that did not correspond to the actual transfer date, emphasizing the importance of carefully tracking legislative changes and their implications in the field of hazardous materials transportation.