The air inside a space capsule is maintained at the required condition by passing it through a set of heat exchangers. The heat exchangers are designed such that the humid air passing through them is cooled and partial condensation of the water vapour occurs. On a psychrometric chart, this process appears as a line which is

A

Horizontal to the left

B

Vertical downwards

C

Diagonal downwards to the left

D

Diagonal upwards to the right