Which area is defined as having flight not prohibited but subject to limitations?

The correct choice is the restricted area, which is defined as airspace where flight is not completely prohibited but is subject to specific limitations. This means that while aircraft are allowed to enter this airspace, they must do so under stringent conditions or may require permission from the controlling authority. Restricted areas are typically established for reasons such as national security, military operations, or safety, where certain activities could pose a danger to aircraft.

In the context of airspace classification, while prohibited areas would restrict all aircraft from entering, the key aspect of restricted areas is the conditional access granted to pilots and aircraft operators. This distinction is crucial for understanding how different airspace classifications manage the flow of air traffic and prioritize safety.

In contrast, warning areas are designated to alert pilots about potential hazards, but they do not restrict access like restricted areas do. Class C airspace refers to a specific type of controlled airspace surrounding busy airports, requiring communication with air traffic control, but it does not imply restrictions related to military operations or specific limitations. Understanding these distinctions helps in grasping regulatory airspace management and safe flight operations within different airspace classifications.