When are headlights required in rainy conditions?

Answer: B — Always, if visibility is reduced

Headlights are required in rainy conditions whenever visibility is reduced. Rain can significantly impact how well a driver can see the road, other vehicles, and any potential hazards. This reduced visibility might not only occur during heavy downpours but also during light rain, especially if the rain causes water to accumulate on the roadway or if the weather conditions make it difficult to see clearly. Using headlights in such scenarios not only helps the driver see better but also ensures that other drivers can see your vehicle, enhancing overall road safety. It's essential to adhere to these guidelines to maintain visibility and safety for everyone on the road.