ANS:A - increase

At constant pressure, with an increase in temperature, the dew point will increase/decrease; it depends on the temperature. The dew point is the temperature at which air becomes saturated with water vapor, leading to condensation. At higher temperatures, the air can hold more moisture before becoming saturated, so the dew point generally increases with temperature. However, this relationship is not linear. As the temperature continues to rise, there comes a point where the increase in the air's ability to hold moisture is outweighed by the increase in the actual amount of moisture in the air. At this point, the dew point may begin to decrease. Therefore, whether the dew point increases or decreases with increasing temperature depends on the specific conditions of temperature and humidity.