ANS:C - both (a) and (b)

The saturated molal absolute humidity of a vapor-gas mixture depends on both the vapor pressure at the dry bulb temperature and the total pressure of the mixture. The molal absolute humidity represents the mass of water vapor present in a unit mass of dry air. It's influenced by the partial pressure of water vapor in the mixture, which depends on both the vapor pressure at the dry bulb temperature (which is related to the temperature itself) and the total pressure of the mixture. So, the correct answer is: both (a) and (b)