Answer: B) Use headlights and drive slowly if you encounter dense fog.
Explanation: Fog begins to form when water vapor condenses into liquid water droplets that are suspended in the air. This happens when the air has a lot of moisture and when the temperature is low (because in this way the water in the air condenses). So if a weather station predicts that warm humid air will pass over much cooler land, the precaution must be to use healights and drive slowly because it will probably be dense fog.
Physical change .. you cannot undo chemical ... physical is like bending , shattering a mirror , denting something .. chemical would be rust or something .
