What does it mean when you see red lights at a traffic stop?

Answer: C — You must stop and wait behind the white stop line

Red lights at a traffic stop indicate that you must come to a complete stop behind the white stop line and wait for the light to turn green. Option A is incorrect because yellow lights indicate "proceed with caution," not red lights. Option B is incorrect because you must stop at a red light regardless of the condition of your exit. Option D is incorrect because you must fully stop at a red light, not just reduce your speed.