You should always wear your seat belt:

Answer: D — At all times

Wearing a seat belt is important for your safety while driving. The other options are incorrect because even though wearing a seat belt at night (A) or during the day (C) is important, it is also important to wear it at all times. Wearing a seat belt while parked (B) may not seem necessary, but it is still important as it can protect you in case of an accident or if someone were to hit your parked car. Therefore, it is always recommended to wear your seat belt at all times while in a moving vehicle.