The amount of water vapor is not related to atmospheric temperature. The amount of water vapor increases as the atmospheric temperature increases. The amount of water vapor increases as the atmospheric temperature decreases. The amount of water vapor decreases as the atmospheric temperature increases.
I gave my students this multiple choice question: Which statement best describes the relationship between the total amount of water vapor the atmosphere can hold and the temperature of the atmosphere?

Only one answer is correct among these 4 choices:
- The amount of water vapor is not related to atmospheric temperature.
- The amount of water vapor increases as the atmospheric temperature increases.
- The amount of water vapor increases as the atmospheric temperature decreases.
- The amount of water vapor decreases as the atmospheric temperature increases.

Could you tell me which one is correct?

The amount of water vapor increases as the atmospheric temperature increases.