What should a pilot do if they are unsure of their clearance?

A pilot should always prioritize safety and clarity in communication when it comes to air traffic control (ATC) clearances. If there is any uncertainty regarding their instructions, the most responsible action is to request clarification from ATC. This ensures that the pilot fully understands the clearance and can execute their flight plan safely and effectively.

By asking for clarification, the pilot prevents potential misunderstandings that could lead to dangerous situations, such as entering controlled airspace without proper authorization or conflicting with other aircraft. Clear communication helps maintain the safety and efficiency of the air traffic system, ensuring that everyone is on the same page.

The other options lack the necessary emphasis on communication and safety that is crucial in aviation operations. Proceeding without clarification could lead to significant risks, waiting indefinitely could create further confusion and potential conflict with other flights, and checking weather updates, while important, does not address the immediate concern of unclear clearance instructions.