A flashing yellow traffic signal at an intersection means:

Answer: D — Slow down and proceed with caution.

The correct interpretation of a flashing yellow traffic signal at an intersection is to slow down and proceed with caution. This signal indicates that while you have the right-of-way, you need to be vigilant and prepared to stop if necessary. It often signifies that there may be other traffic, pedestrians, or potential hazards that require a driver's attention and careful driving through the intersection. The other options imply restrictions or definitive actions that do not accurately reflect the guidance of a flashing yellow signal. This signal does not prohibit turns or indicate that a driver must yield the right-of-way, but rather encourages careful observation and a cautious approach to the intersection.