Correct option is C
The relative humidity is 25%, which means that the air is holding only 25% of the maximum amount of water vapor it could hold at 25°C. In this case, the air mass is far from being saturated.

Information Booster:
Relative Humidity is crucial in understanding weather patterns and comfort levels. Lower RH means air is drier, while higher RH means air is more humid.
The Saturation Mixing Ratio increases with temperature. For example, at higher temperatures, the air can hold more water vapor, which would increase the RH if the actual water vapor content remains the same.