What should you use to signal a lane change?

Answer: B — Your turn signal

Using your turn signal is the appropriate way to signal a lane change because it communicates your intent to other drivers on the road. This helps ensure safety by making your movements predictable. Proper signaling allows other vehicles to anticipate your actions and adjust accordingly, reducing the risk of accidents. While some other methods, like hand gestures or flashing headlights, can be used to communicate with other drivers in specific situations, they are not the standard method for signaling a lane change. Honking your horn can alert other drivers but does not convey the same clear intent regarding your movements. Using your turn signal is standardized and is mandated by traffic laws, which makes it the most effective and recognized method for indicating a lane change.