Final answer:
At night, it is most appropriate to use low beams as they provide necessary illumination without blinding other drivers. High beams can be used when there is no oncoming traffic, while emergency flashers are for emergency situations only.
Step-by-step explanation:
While driving at night, the proper lights to use as often as possible are your low beams (D). Low beams are designed to illuminate the road ahead of you without blinding oncoming traffic. On the other hand, high beams (A) should be used in rural areas or dark streets where there are no other cars in sight, as they provide a brighter and longer range of visibility. It is crucial not to look directly at very bright lights, including high beams of oncoming vehicles, as this can impair your night vision and temporarily blind you.
Using emergency flashers (B) is only for situations where your vehicle is a hazard to other drivers, like when you're stopped on the road due to an emergency. Novelty lights (C) often are not regulatory compliant and should not be relied upon for functional illumination when driving.