What should you do when you see a flashing yellow signal at an intersection?

Answer: C — Slow down and cross carefully

When you see a flashing yellow signal at an intersection, the correct action is to slow down and cross carefully. A flashing yellow signal indicates that drivers should approach with caution and be prepared to yield to any pedestrians or other vehicles in the intersection. It warns you to be vigilant but does not require a complete stop like a red signal would. The context helps clarify why the other options are less appropriate. Speeding up to cross quickly could lead to dangerous situations if other vehicles or pedestrians are present, increasing the risk of an accident. Stopping immediately is unnecessary and could cause confusion for other drivers. Lastly, waiting for a green signal is not required, as the flashing yellow means you are permitted to proceed, provided you do so safely. In summary, the flashing yellow signal guides drivers to proceed with caution rather than stop or accelerate unnecessarily.