What should you do if you see a stop sign ahead?

Answer: B — Reduce speed and prepare to stop

When approaching a stop sign, the appropriate action is to reduce speed and prepare to stop. This is important because a stop sign indicates that you must come to a complete halt before proceeding. By reducing speed, you give yourself the necessary time to assess your surroundings and follow the law, ensuring the safety of yourself and other road users. At a stop sign, drivers are required to come to a full stop—this differs from merely slowing down; stopping completely allows drivers to check for pedestrians, other vehicles, and any potential hazards before continuing. Taking the measures suggested in the other choices would not comply with traffic laws or safe driving practices. For instance, increasing speed to pass quickly would pose a serious danger, as well as ignoring the requirement to stop. Similarly, simply slowing down without coming to a full stop does not meet the legal requirement of yielding at a stop sign, and only looking for other road signs does not address the immediate need to obey the stop sign itself.