What should you do before making a lane change?

Answer: B — Check mirrors and blind spots

Before making a lane change, it is crucial to check mirrors and blind spots. This ensures that you have a clear understanding of the surrounding traffic and that there are no vehicles or obstacles in the lanes next to you. By checking your mirrors, you can see other vehicles that are in your immediate vicinity, while looking into your blind spots allows you to identify any cars that may not be visible in your mirrors. This practice helps prevent accidents and enhances overall road safety by ensuring that you are fully aware of your surroundings before executing the maneuver. Using your horn to signal others, although it might alert other drivers of your presence, does not provide a safe way to confirm that the lane is clear. Accelerating to merge quickly can lead to dangerous situations, as it might not give you adequate time to assess the traffic conditions. Additionally, making a lane change without signaling is not only unsafe but also against traffic laws, as it may confuse other drivers and increase the risk of collisions. Thus, the best and safest approach is to check mirrors and blind spots thoroughly before making a lane change.