What should you do if you are unsure about your ability to pass another vehicle?

Answer: B — Do not attempt to pass

If you are unsure about your ability to pass another vehicle safely, the best course of action is to refrain from attempting to pass. This decision prioritizes safety, as passing requires careful judgment about speed, distance, and the ability to maneuver back into your lane safely. If there is doubt, it is better to maintain your position behind the slower vehicle until you are certain that it's safe to execute the pass. Attempting to pass without confidence can lead to dangerous situations, such as misjudging the speed of oncoming traffic or being unable to return to your lane safely. Safety should always be your top priority when driving, and waiting until you have a clear and confident opportunity is the best approach. Additionally, assessing the road conditions, traffic situation, and your own vehicle capabilities can help make future passing decisions safer.