What action is required when an aircraft penetrates restricted areas?

When an aircraft penetrates restricted areas, obtaining clearance from the controlling authority is the correct action. Restricted areas are designated for specific uses, such as military operations or other activities that may pose a hazard to civilian air traffic. These areas are published in the relevant aeronautical charts and are often subject to airspace management by the appropriate authorities.

When an aircraft inadvertently enters such airspace without prior clearance, it is crucial to communicate with the controlling authority to assess the situation and determine whether it is safe to remain in the area or if an immediate exit is required. This interaction ensures that the aircraft does not interfere with operations happening within the restricted area and helps maintain safety for both the aircraft and any activities occurring within that airspace.

The other options, while potentially reasonable actions in different contexts, do not adequately address the specific requirements of entering restricted airspace. Reporting to the nearest tower, circling the area, or continuing to the final destination, do not fulfill the necessary protocol for restricted area compliance and could lead to safety issues or further complications.