While on watch，you notice that the air temperature is dropping and is approaching the dew point.Which type of weather should be forecasted（）.

A.The temperature rises after a cold front passes
B.The barometric pressure rises when a warm front passes
C.A cold front generally passes faster than a warm front
D.A warm front usually has more violent weather associated with it than a cold front

A.Ridge
B.Col
C.Trough
D.Bora