Final answer:
The nurse's best response in this situation would be to offer to get the forms for the patient while also initiating a conversation about their decision to leave treatment.
Step-by-step explanation:
The nurse's best response in this situation would be option C: "I will get [the forms] for you, but let's talk about your decision to leave treatment." This response acknowledges the patient's request while also addressing their decision and opening up a conversation about it. It shows that the nurse is concerned about the patient's well-being and is willing to discuss their concerns and reasons for wanting to leave treatment.