Why should a driver reduce the speed of a vehicle at night?

Answer: D — To allow eyes to recover from glare

Driving at night often brings with it additional challenges and risks that are not faced during the day. While the darkness can limit visibility and make it difficult to see hazards on the road, driving with bright headlights and street lights can also cause glare and strain on the eyes. By reducing the speed of the vehicle, the driver can give their eyes more time to adjust and recover from the effects of the glare. This can improve reaction times and overall safety while driving at night. The other options, such as saving fuel, avoiding insects, and minimizing wind noise, do not directly pertain to the risks of night driving and are therefore incorrect answers.