What does a solid red traffic light mean?

Answer: B — Stop and wait until the light turns green

A solid red traffic light indicates that all vehicles must come to a complete stop at the intersection. This rule is in place to ensure the safety of everyone on the road, including drivers, passengers, and pedestrians. After stopping, drivers are required to wait until the traffic light turns green before proceeding. This is a fundamental traffic law that helps maintain the flow of traffic and prevents accidents at intersections. While some other options might seem relevant in specific contexts, they do not apply to the clear directive of what a solid red light signifies. For instance, proceeding with caution could lead to misinterpretations of safety, yielding to pedestrians is typically required at a green light, and turning left might be allowed under certain conditions but is not a standard action associated with a red light. Understanding and adhering to the rule of stopping at a red light is crucial for all drivers to ensure road safety.