If you encounter a clearance limit without holding instructions, what is the priority response?

When encountering a clearance limit without holding instructions, choosing to hold in a standard pattern as needed is the correct response because it ensures safety and compliance with air traffic control procedures. This action allows the pilot to maintain a safe distance from the clearance limit while awaiting further instructions from air traffic control. Holding in a standard pattern is a well-understood and recognized procedure that offers a structured way to manage the situation, minimizing the risk of conflicting traffic and ensuring that the pilot remains within regulatory guidelines.

Other options, while they may seem viable, could lead to potential safety issues. Proceeding on course without proper clearance might violate air traffic control instructions or lead to an inadvertent infringement of controlled airspace. Requesting another clearance immediately may not be the most efficient first action since the pilot must maintain control of the aircraft and ensure it's safely managed while waiting for instructions. Circling until instructed, while somewhat similar to holding, lacks the structure and predictability of a standard holding pattern, which is specifically designed to manage traffic and operations in a controlled manner.