Winds weakened. Humidity decreased. Air pressure dropped. Temperatures increased.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Juan noticed that sunny skies suddenly became stormy. Which most likely happened when the weather changed in this way?
Possibilities:
- Winds weakened.
- Humidity decreased.
- Air pressure dropped.
- Temperatures increased.

Air pressure dropped.