How recent must special training be for drivers transporting controlled radioactive material?

Answer: B — Within the past two years

For drivers transporting controlled radioactive material, special training must be completed within the past two years to ensure that they are up-to-date with the latest safety protocols, regulations, and emergency response procedures. This period reflects the importance of regularly refreshing knowledge and skills to adapt to any changes in regulations or safety practices that may occur as technology and legal standards evolve over time. Keeping training current within a two-year timeframe helps to enhance safety for both the driver and the public when handling hazardous materials, thus minimizing potential risks associated with the transportation of radioactive materials.