sunlight warming the surface of oceans air rising into colder regions of the atmosphere lightning heating the air in the atmosphere winds blowing along the surface of the ground
I gave my students this multiple choice question: Which of these could cause water vapor to condense into rain droplets?

Only one answer is correct among these 4 choices:
- sunlight warming the surface of oceans
- air rising into colder regions of the atmosphere
- lightning heating the air in the atmosphere
- winds blowing along the surface of the ground

Could you tell me which one is correct?

air rising into colder regions of the atmosphere