Industrial packages for radioactive materials are designed to handle:

The correct answer highlights that industrial packages for radioactive materials are specifically designed to handle low concentrations that are considered limited threats. This is important because different levels of radioactivity entail varying degrees of risk and require appropriate containment and handling measures. These packages ensure safety by restricting exposure to low-level radioactive materials effectively.

Packages for radioactive materials must adhere to strict regulatory standards that account for the potential hazards posed by the materials they transport. While the design can accommodate low concentrations well, such precautions and designs are tailored not just for less hazardous materials, but also with the understanding that even low-level radioactive substances need careful management to prevent unnecessary risk to handlers and the public.

Higher concentrations of radioactivity would necessitate different packaging specifications and protocols due to the increased risk and potential for exposure, making options involving high concentrations or significant threats less suitable. Therefore, industrial packages function within strict limits to ensure safety and compliance in handling low levels of radioactive materials, thus emphasizing the correct choice.