Which of the Following Would Count as an Objection to Rachels's

Which of the following would count as an objection to Rachels's conclusion that a doctor's letting someone die for humane reasons is not relevantly different than a doctor's actively euthanizing a patient for humane reasons?

A) There is an important distinction between killing and letting die because most cases of killing outside of medical contexts are worse than most cases of letting die outside of a medical context.
B) There is an important distinction between active and passive euthanasia because in cases of passive euthanasia, it is the disease or defect that kills the patient, not the doctor.
C) There is an important distinction between active and passive euthanasia because active euthanasia is often quicker and less painful.
D) There is an important distinction between killing and letting die because in cases of letting die, one does not necessarily intend the death of the victim.