The answer would be a because u need to make sure the wound isn't infected an the bacteria stays inside the covering which causes your hand to be infected.<span />
Please give the answers so that we can help you out.
The answer to your question is
D.
Hepatic portal system.
WE can keep everything sterile, and germ free therefore preventing infections spreading or being exposed to other people. This will help the healing process because we know how to treat a infection and get the proper treatment to cure it.