Final answer:
Hazardous materials that can and cannot be transported by bus are regulated by DOT and EPA. The answer to the question is d) All of the above.
Step-by-step explanation:
Hazardous materials that can and cannot be transported by bus are regulated by the United States Department of Transportation (DOT) and the Environmental Protection Agency (EPA). According to DOT regulations, flammable liquids, radioactive materials, explosives, corrosive materials, flammable gases, and oxidizing substances are all considered hazardous materials. Therefore, the correct answer is d) All of the above.