Which scenario indicates a prohibited action?

The scenario that indicates a prohibited action is one in which there are no practical alternatives available without variance and mitigation. This circumstance implies that the action cannot proceed under the existing rules or regulations without obtaining special permission or modifications, which is indicative of a restriction on that action.

In practical terms, if an action necessitates variance and mitigation measures, it signifies that the standard protocols or guidelines do not accommodate it comfortably. This indicates that the action is in a gray area where special considerations may need to be evaluated, suggesting that proceeding without such measures could lead to violations of regulations or standards.

Other scenarios imply different levels of compliance and authorization. For instance, when there is a requirement for an approved mitigation strategy or when authority has granted permission, these indicate that the action may proceed but with certain stipulations in place. The option that states an action is allowed without any criteria further illustrates that there are no restrictions or prerequisites needed, marking it as permissible. Thus, B effectively highlights the notion of prohibition due to the lack of viable alternatives.