【正确答案】 C

【答案解析】文章第五段提到“A doctor who took a positive step such as giving a lethal injection-to help a patient die would, as the law stands, be guilty of murder or aiding and abetting suicide”，可以看出，只有积极的作为去帮助病人死亡才是有罪的。所以答案应该为C。