Consider the following statements: 1. If air heated in a closed chamber, its dew point will increase 2. As relative humidity decreases the difference between the wet-bulb temperature and dew point will increase 3. In spray humidification process, the enthalpy of air will decrease 4. The dew-point temperature is always an indication of moisture content of the air

• A. 1 and 2            
• B. 2 and 4
• C. 1 and 3            
• D. 3 and 4