What must drivers do when a traffic officer signals them to stop?

Answer: A — Comply immediately and safely pull over

When a traffic officer signals a driver to stop, it is crucial for the driver to comply immediately and safely pull over. This action is important as it demonstrates respect for law enforcement and adherence to traffic laws. Traffic officers are trained to direct vehicles for various reasons, including safety concerns, law enforcement, or traffic management. By stopping promptly, the driver helps maintain the flow of traffic and minimizes the risk of accidents or further complications that could arise from ignoring or disobeying an officer's signal. Furthermore, failing to stop when requested can lead to serious legal consequences, such as fines or charges, as it is considered an obstruction of justice or disrespect toward law enforcement. The other choices involve actions that could be dangerous, unlawful, or irresponsible, endangering not only the driver but also other road users.