If when water vapor condenses overnight, the temperature has reached the dew point, then what about the temperature may cause water vapor to condense overnight and in the early morning?

Answer choices:
- It reaches the dew point
 - It reaches Kelvin point
 - Movement of an air mass
 - Warm air moving into cold air
 - It reaches evaporation point
 - Temperature changing
 - preventing heat transfer
 - It is too dark to measure

 

 It reaches the dew point         