What does a yellow traffic light mean?

Answer: B — Prepare to stop; the light is about to change to red

A yellow traffic light signals that the light is about to turn red, indicating that drivers should prepare to stop. It serves as a warning to alert motorists that they need to evaluate their position at the intersection. If a driver is already in the intersection when the light turns yellow, it is usually safe to continue through, but if approaching, they should be ready to bring their vehicle to a stop. This traffic light's function is crucial as it helps maintain the flow of traffic and reduces the risk of accidents that can occur when vehicles attempt to proceed through an intersection during a red light. It emphasizes the importance of vigilant driving and adherence to traffic signals to ensure the safety of all road users.