ANS:C - ∞

At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes ∞. At the boiling point of a liquid, the liquid is in equilibrium with its vapor phase. This means that the rate of evaporation equals the rate of condensation, and the vapor is said to be saturated. At this point, the air is holding the maximum amount of water vapor it can hold at that temperature and pressure, and any additional water vapor introduced will immediately condense back into liquid form. Therefore, the saturated absolute humidity (the maximum amount of water vapor the air can hold at that temperature and pressure) becomes infinitely high at the boiling point, as any water vapor introduced will be immediately condensed.