Who is responsible for enforcing TDG regulations in Canada?

The correct answer is Transport Canada because it is the primary federal institution responsible for the enforcement of Transportation of Dangerous Goods (TDG) regulations in Canada. Transport Canada ensures the safety and security of the transportation system, which includes the oversight of hazardous materials during their transport. This includes setting standards, conducting inspections, and providing education and guidance related to the TDG regulations.

Other agencies, such as Environment Canada and Health Canada, have roles related to environmental impact and public health, respectively, but they do not enforce the TDG regulations. Similarly, the Canadian Transport Authority does not exist as a specific agency in charge of TDG; rather, the enforcement and regulation fall under the mandate of Transport Canada.