increase in humidity decrease in temperature clouds forming in the sky winds blowing in the night
I gave my students this multiple choice question: In some locations, squirrels sleep for long periods of time during the winter months. Which of the following most likely causes these squirrels to sleep for long periods of time?

Only one answer is correct among these 4 choices:
- increase in humidity
- decrease in temperature
- clouds forming in the sky
- winds blowing in the night

Could you tell me which one is correct?

decrease in temperature