Upslope Fog Hugging the Mountain Surface Occurs When

Multiple Choice

Upslope fog hugging the mountain surface occurs when

A) air cools because of decreasing atmospheric pressure; eventually air cools to the dew point.
B) air warms because of decreasing atmospheric pressure; eventually air cools to the dew point.
C) air cools because of increasing atmospheric pressure; eventually air cools to the dew point.
D) air warms because of decreasing atmospheric pressure; eventually air warms to the dew point.