As a cold front passes by, the dewpoint?

When a cold front passes, the temperature of the air behind the front drops significantly. Since the dew point is essentially the temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid, it is closely related to temperature. As the cooler air mass replaces the warmer, moisture-laden air ahead of the cold front, the humidity decreases.

Consequently, the dew point also experiences a sharp drop because the cooler air can hold less moisture compared to the warmer air preceding the front. This reduction in temperature and moisture availability leads to a rapid decline in the dew point, which is why it experiences a sharp drop as the cold front moves through.

Other options imply either an increase in dew point or a gradual drop, which does not accurately reflect the dynamics of a cold front where a significant change in temperature and moisture occurs rapidly.