Which factor could impair a driver's visibility on the road?

All of the listed factors can significantly impair a driver's visibility on the road. Weather conditions, such as rain, fog, or snow, can reduce clarity and make it difficult to see other vehicles, road signs, and traffic signals. An obstructed view from the vehicle, which can occur due to improperly adjusted mirrors or items blocking the driver's sight, can prevent a driver from noticing hazards or other road users, creating unsafe situations. Additionally, glare from sunlight can momentarily blind drivers, making it challenging to see the road and surroundings clearly, especially during sunrise or sunset when the sun is low on the horizon. Each of these factors affects visibility, making it crucial for drivers to be aware and adjust their driving patterns accordingly.