A weather front is an area where two air masses meet which of the following weather fronts would you expect to result in a thunderstorm
A. a cool air mass moving into an are with a warmer air mass
B. a cool air mass moving into an area with a cool air mass already resulting in a large cool air mass
C. a warm air mass moving into an area where there is already a warm air mass resulting in a massive warm air mass
D. cooler air rising and warm air sinking