The correct answer is: D. An increase in temperature will cause condensation to occur.
When the air is saturated, the relative humidity is 100%. This means that the air is holding as much water vapor as it can at that temperature. If the temperature increases, the air can hold more water vapor, so the relative humidity will decrease. If the temperature decreases, the air can hold less water vapor, so the relative humidity will increase.
The wet-bulb temperature is the temperature of a thermometer that is covered with a wet cloth. The wet cloth evaporates water, which takes heat away from the thermometer. This causes the wet-bulb temperature to be lower than the air temperature.
The dew point temperature is the temperature at which the air becomes saturated. If the air is cooled below the dew point temperature, condensation will occur.
Therefore, an increase in temperature will not cause condensation to occur.