When towing a trailer, you should:

Answer: B — Increase your following distance

When towing a trailer, you should increase your following distance to allow for the extra weight and potential longer braking distance. Option A, signaling at least 200 feet before turning, is a good driving practice in general, but it is not specific to towing a trailer. Option C, turning sharply, is dangerous as it can cause the trailer to sway and potentially lead to an accident. Option D, driving in the right lane, is not incorrect, but it is not the most important consideration for safe towing. In general, the right lane is preferred for towing as it allows for easier merging and slower speeds. However, the most important action to take while towing a trailer is to increase your following distance.