●Dehumidification is the process of removing moisture from air with dry bulb temperature remaining same.

●In the psychrometric chart we can see that horizontal line(vertical axis) indicates the a humidity ratio (moisture contain) and vertical line (horizontal axis) indicates thedry-bulb temperature  On moving from point 1 to point 2 moisture content of air will reduce but the value of dry-bulb temperature  remain same in the psychrometric chart.

Hence, the correct option is (C).

Where, A = Humidifying only,

B = Heating and humidifying,

C = Sensible heating only   
D = Chemical dehumidifying,

E = Dehumidifying only,
F = Cooling and dehumidifying,

G = Sensible cooling only and
H = Evaporative cooling only.