If the temperature falls to 50 F and the dew point is 50 F, which statement is true?

If the temperature falls to 50 F and the dew point is 50 F, which statement is true?
A. The relative humidity is 50% and the air is saturated
B. The relative humidity is 50% and the air is unsaturated
C. The relative humidity is 100% and the air is saturated
D. The relative humidity is 100% and the air is unsaturated