The correct options are
A Cotton is a good absorber of water or sweat .
C Cotton clothes have fine threads which easily allow air to pass through.
Cotton, being a good absorber of water helps in absorbing the sweat and exposing it to the atmosphere for easy evaporation.
Cotton clothes have fine threads which easily allow air to pass through. With more air flowing through the clothes, the sweat from the body surface gets evaporated easily.
As a result, the body cool down.
Polyster and nylon resist moisture and are not ideal for hot summer weather.