What is the purpose of making a head check before changing lanes?

Answer: B — To check what is in your blind spot

Making a head check before changing lanes is crucial for safety because it allows you to check your blind spot, which is an area that is not visible in your mirrors. Blind spots are potential danger zones where other vehicles or objects may not be seen, even if the lane appears clear in your mirrors. By turning your head and looking over your shoulder, you can identify any vehicles that might be in those blind spots, helping to prevent collisions when you change lanes. In contrast, while checking for pedestrians, ensuring the lane is clear ahead, and signaling intentions are all important aspects of safe driving, they do not specifically address the need to look for blind spots. The head check is a unique maneuver that directly helps in detecting hidden dangers while changing lanes.