On What Grounds Does Pruss Argue That the Fertilized Egg

On what grounds does Pruss argue that the fertilized egg is not a "part" of the mother?

A) The fertilized egg is genetically distinct from the mother.
B) The fertilized egg engages in self-directed behavior such as releasing hormones that trigger changes in the woman.
C) If the fertilized egg were merely a part of the mother, it would have to be a part of the father for the same reason. But that's absurd.
D) All of the above