Explanation:

- Relative humidity is the ratio of the current amount of water vapor in the air to the maximum amount the air can hold at that temperature.

- When air temperature rises, the air can hold more water vapor.

- *Option 1: increases* - Incorrect. Relative humidity decreases as capacity for holding moisture increases.

- Option 2: decreases - Correct. As temperature rises, the moisture capacity increases, often leading to reduced relative humidity.

- Option 3: does not change - Incorrect. Relative humidity changes with temperature.

- Option 4: may increase or decrease - Technically possible, but typically, relative humidity decreases as temperature rises without new sources of moisture.