What does a flashing red light mean at an intersection?

Answer: C — Treat it like a stop sign; stop and proceed when safe

A flashing red light at an intersection indicates that drivers must treat it like a stop sign. This means you should come to a complete stop before proceeding, ensuring that the way is clear and it's safe to continue. This signal is used to alert drivers to potential hazards and ensures that they come to a halt to assess the traffic situation before moving through the intersection. By following this rule, drivers can prevent accidents and ensure a smooth flow of traffic. The requirement to stop allows for safe interactions with other vehicles and pedestrians that may be present, thereby promoting safety at intersections where visibility might be restricted or where traffic patterns are complex.