it's not that you have to choose between two arbitrarily right answers, it's that only one of those answers is the right one for a nurse with a good working knowledge of nursing process to do. this is a very hard concept for nursing students to grasp, because it is not like anything else they ever studied. but that's what you need to learn in nursing school, along with the science and other factual stuff to support your practice of nursing.
i'll give you an example.
a patient/client who has been admitted to the hospital after spousal abuse tells you that "he's really sorry now, brought me flowers, swears he'll never do it again, says he loves me." she has previously disclosed that he has abused her before, but this was the worst episode. she is talking about going home. what does the nurse say? (i'll eliminate the two obviously-wrong answers)
1. "and yet he has done and said this before. before you leave, let's think of a plan to keep you safe."
2. "abusers always say this, it's part of the cycle of abuse we discussed before. it is probably dangerous to go home with him."
now, there is a correct answer, and only one. i know that #2 is factually correct, and it's something that anybody on the street would tell you.
but you aren't just anybody, you're the nurse. once you say that, you deny her feelings, cut off future conversation and support with her, eliminate any chance of a therapeutic relationship with her, and have not helped to bring her along the road to health. any well-meaning but nontherapeutic person could do that.
but ... you are the nurse.
#1 is the only answer. she has the right to make her own decisions, even if the nurse does not agree with them.
the therapeutic response, the best response a nurse can give due to the nurse's education, restates the patient's words, recognizes her right to choose, and by giving her a tool to protect herself, moves her along the path to better health (safety). that is what the nurse does, as opposed to the well-meaning lay person.
this is nursing. (and btw, this has nothing at all to do with the medical plan of care. nursing is an autonomous discipline.) it is a higher concept than "common sense," and that is why it is sometimes hard for students to grasp.