The correct option is C.
The recovery process is used to remove refrigerant from an AC system in order to store it in an external container. The refrigerant has to be removed because it destroys ozone layer and cause global warming. It also has negative effects on the living organisms generally.<span />
Parasites are organisms that survive by harming anouther organism (feeding off of it, ex. tick, flea)
It is called a watershed.
