What does a solid amber light signify?

Answer: C — Stop at the stop line

A solid amber light on a traffic light signifies that you must come to a complete stop at the stop line. While options A, B, and D may seem similar, they do not accurately represent the specific action that must be taken when faced with a solid amber light. Option A suggests rushing through the intersection, which is unsafe and may result in a traffic violation. Option B states to stop if it is safe, but this is not a complete stop as required by a solid amber light. Option D suggests proceeding with caution, which is not enough when faced with a solid amber light, as a full stop is necessary. Therefore, option C is the correct answer, as it accurately reflects the action required when approaching a solid amber light.