To What Does Rachels Attribute the Commonly Held Opinion That

To what does Rachels attribute the commonly held opinion that killing is intrinsically worse than letting someone die?

A) Moral intuitions supported by sound philosophical reasoning
B) The hold that religious dogma continues to have even on those who understand themselves as nonbelievers
C) The fact that most actual cases of killing are more reprehensible than most actual cases of letting a person die
D) All of the above