Under California criminal law which is correct:
a) Where the victim's act is unreasonable, unforeseeable or daft, it breaks the chain of causation and there can be no crime.
b) A victim's refusal of medical treatment on medical grounds is always unreasonable.
c) Where the victim is a fully informed and responsible adult, and freely and voluntarily self-administers drugs supplied by D, D has not caused the victim's death.
d) Where the victim is a fully informed and responsible adult, and freely and voluntarily self-administers drugs supplied by D, D has caused the victim's death.