A red light means:

Answer: C — You must yield and prepare to stop

A red light almost always indicates that it is time to stop and wait for the light to turn green. Options A and B are incorrect as they promote unsafe driving practices. Accelerating or moving forward through a red light is extremely dangerous and can result in accidents or other serious consequences. Option D is also incorrect as it instructs drivers to merge into another lane, which may not be safe or allowed when facing a red light. Remember, a red light means you must yield and prepare to stop.