the temperature of the air the temperature of the ocean the density of clouds in the sky the amount of rainfall on a rainy day
I gave my students this multiple choice question: What is the best measure to use in determining the effect of solar energy on Earth's atmosphere?

Only one answer is correct among these 4 choices:
- the temperature of the air
- the temperature of the ocean
- the density of clouds in the sky
- the amount of rainfall on a rainy day

Could you tell me which one is correct?

the temperature of the air