People get Chicken pox just by contact. It is a contagious disease in other words, an air borne disease.
Pretty sure it could be head circles because your neck is really delicate and if something happens, you could get seriously hurt or disabled from moving. (Sorry if I’m wrong, I’m no doctor)
All of the above are correct
B, Matthew is skipping meals which is a harmful behavior in its self, as well as smoking and sleeping at random hours.