Where are reporting marks placed on intermodal tank containers?

Answer: C — Right side as the responder faces it

The correct answer regarding the placement of reporting marks on intermodal tank containers is that they are found on the right side as the responder faces the container. Reporting marks are essential identifiers assigned to rail cars and intermodal containers, providing vital information regarding the ownership and service record of the tank container. Placing these marks on the right side allows for greater visibility and recognition when the container is positioned on a flatbed or rail car, making it easier for responders and personnel to quickly identify pertinent information during emergency situations or routine inspections. This strategic placement enhances operational efficiency and safety as it provides a standardized location across various container types. The other options do not conform to such standards for marking, either not being visible enough (like the backside or underneath) or being positioned inaccurately.