When a Dense Fog Blanket an Area at Night,you Can

When a dense fog blanket an area at night,you can often hear traffic noises coming from a distance highway or jets taking off from an airport several miles away.The reason is because

A) when it is foggy there are layers of air at different temperatures so that some sound waves are reflected at the interface rather than spreading in all directions.
B) when it is foggy,the air is still so you can hear sound better.
C) on foggy days or nights your hearing is more acute,to make up for the reduced visibility.
D) it is all in your head,it just seems that way.
E) none of the above