Answer: All of the above
Explanation:
The function of the vehicles headlights is to illuminate the roadway and ensure facilitate safe driving. 
The headlights should be used during hours of darkness, when the driver can't see clearly, during bad weather conditions and for every other conditions whereby the road isn't visible enough.
Therefore, the correct option is "All of the above".
 
        
             
        
        
        
The correct option would be d because areas at high altitudes have warmest water because they have direct contact with sunlight
        
             
        
        
        
The Tundra Biome.
Hope this helps :D