Final answer:
When a driver follows you too closely, you should move to another lane if possible to ensure your safety and avoid a potential collision.
Step-by-step explanation:
When a driver follows you too closely, it is important to prioritize your safety and respond appropriately. The correct action to take is option B: move to another lane if possible. By changing lanes, you create a buffer zone between you and the tailgating driver, reducing the risk of a collision. It is not recommended to increase your speed (option A) as it can contribute to more dangerous situations, and braking suddenly (option C) can cause a rear-end collision. Activating your stop lights (option D) is a good idea to warn the driver behind you of your intention to slow down or stop, but it should be done after safely moving to another lane.