What does a stop sign indicate to drivers?

Answer: C — Come to a complete stop

A stop sign instructs drivers to come to a complete stop at the designated location. This is crucial for ensuring safety at intersections and other areas where visibility may be limited. When a driver encounters a stop sign, they are expected to halt their vehicle completely, check for other vehicles and pedestrians, and only proceed when it is safe to do so. This regulation helps prevent accidents and facilitates a controlled flow of traffic. In contrast, the other options do not reflect the legal requirement associated with a stop sign. It's important to understand that simply slowing down or yielding is insufficient; a complete stop is mandatory to fully comply with traffic regulations. The stop sign serves as a clear and universally recognized command that promotes attentiveness and caution among drivers and ensures pedestrian safety as well.