What type of materials can be transported by an MC-338 cryogenic tanker?

An MC-338 cryogenic tanker is specifically designed for the transportation of liquefied gases at very low temperatures, commonly known as cryogens. These can include substances such as liquid nitrogen, liquid oxygen, liquid argon, and other gases that exist in a liquid state at extremely low temperatures. The design of the MC-338 tanker includes insulation and pressure control systems that are necessary to safely store and transport these materials, which can be hazardous if not handled correctly.

Liquid nitrogen and other cryogens require specialized containers due to their extremely low boiling points and the risk of rapid gas expansion. The MC-338 is constructed to maintain these low temperatures and handle the pressures involved with transporting such substances, making option B the correct choice.

In contrast, other options refer to materials that do not require cryogenic transport. Bulk powders and fertilizers, concentrated acids, and non-flammable gases have different handling and transport requirements that do not necessitate the specialized capabilities of a cryogenic tanker.