Suppose it is a winter night and at about 11 p.m., the air cools to the dew-point temperature and a thick radiation fog develops. If the air continues to cool during the night, in 5 hours the dew point temperature will probably:

• A. Decrease as the air becomes drier
• B. Decrease as the air becomes moister
• C. Increase as the air becomes drier
• D. Increase as the air becomes moister