Final answer:
The TMU-20/E cryotainer likely holds 20,000 gallons, as the '20' in its model number typically indicates its capacity in gallons.
Step-by-step explanation:
The TMU-20/E cryotainer is a specialized container used to transport and store cryogenic liquids. The letter 'E' typically stands for the English version of the cryotainers, which are used for transport and ground storage of liquefied gases under pressure. To answer the question of how many gallons a TMU-20/E cryotainer will hold, we look at the number associated with the model. In most cases, the numerical value in the model name of a container gives an indication of its capacity. However, without specific industry knowledge or a direct source specifying the exact capacity, we cannot be absolutely certain which option is correct. Based on a common pattern of model numbers representing capacity, it is possible to make an educated guess that the '20' in TMU-20/E might suggest a 20,000-gallon capacity, therefore option C) 20,000 gallons would be a logical assumption.