The shipment of dry ice is considered minor danger and falls within packing group:

The correct packing group for the shipment of dry ice is associated with its classification as a minor danger. Dry ice, which is solid carbon dioxide, is categorized under hazardous materials because it can pose risks such as asphyxiation in confined spaces due to its sublimation leading to high carbon dioxide levels. In terms of packing groups, dangerous goods are classified into four groups based on the level of danger they present during transport.

Packing group 3 applies to substances that present only a minor hazard in transport, which is consistent with the classification of dry ice. Dry ice’s primary hazard is due to asphyxiation risk, not toxicity or flammability, making it appropriate for this grouping.

The other options represent higher categories of danger, where packing groups 1 and 2 indicate more severe risks to health and safety, including the potential for serious toxicity, flammability, or other significant hazards during transport, and are not consistent with the attributes of dry ice. Packing group 4 refers to materials that require additional safety measures due to their corrosive properties or other significant dangers. Hence, these groups do not align with the characteristics of dry ice, affirming that packing group 3 is indeed the accurate classification for this substance.