The driver of a car being passed must _________ until the pass is complete.

Answer: C — Not increase speed

The correct answer is that the driver of a car being passed must not increase speed until the pass is complete. This behavior is essential for maintaining safety on the road. When a driver is being passed, increasing speed can create dangerous conditions, as it may lead to the passing driver misjudging the available space and time needed to complete the maneuver safely. By keeping their speed steady, the driver being passed helps ensure that the vehicle attempting to overtake can do so without unnecessary risks. This action ultimately contributes to smoother traffic flow and reduces the potential for accidents during passing. While it may seem reasonable for someone to think about changing lanes or signaling, these actions are not directly related to the proper response of the driver being passed. The intent behind the rules is to prioritize safety for all drivers involved in the passing situation.