Please help me with this philosophy multiple answers question

Question

The egoist will often give common sense answers to whether e.g. it is ethical to kill. She will say that it is (usually) not, because killing people in civilized society is likely to end badly for you, and so is against your own interests. But suppose that you are in a situation in which, all things considered, it really is in your interests to murder someone. Then the egoist would say: 

A.That it is nevertheless wrong to commit murder.

B.That if it clearly serves your interests more than the alternative, committing murder is okay. But you aren't obliged to go through with it.

C.That if it clearly serves your interests more than the alternative, it is ethically obligatory for you to commit murder. I.e. you are unethical if you don't.

D.That it depends whether murder would, in that case, involve treating a person as a means rather than an end.

Answer 1

The answer is C. According to ethical egoism, it’s your duty to do whatever is in your best interests, no matter what this happens to be. If killing someone is in your best interests, then it’s not just okay for you to do it—it’s your duty to do it.