You are presented with the question "Where do thunderstorms come from?" and the following answer choices: 
- Too much rain in the clouds
 - When the environment is too cold
 - Earth's axis of rotation is tilted
 - fissures of hot, acidic water
 - More than one trophic level.
 - it flows to a lower level
 - Dryness in the environment
 - When cold air advances on warm air

Now knowing that cold fronts cause thunderstorms as they pass by and if cold air is advancing on warm air, the front is called a cold front, choose the best answer.


 

        When cold air advances on warm air 