A nurse is caring for a client who has bipolar disorder and is refusing to take prescribed medications. Which of the following ethical principles is the nurse displaying when he supports the client's refusal of medications?

The correct answer is A: Autonomy. Autonomy refers to the individual's right to make decisions about their own health care. By supporting the client's refusal of medications, the nurse is respecting the client's autonomy and right to make decisions about their own treatment. This empowers the client to have control over their own care.

Choice B: Justice, is incorrect as it pertains to fairness and equal treatment, which is not directly related to the client's refusal of medications. Choice C: Veracity, is incorrect as it relates to honesty and truthfulness, which is not the main ethical principle demonstrated in this scenario. Choice D: Beneficence, is incorrect as it refers to the obligation to do good and act in the best interest of the client, which would typically involve encouraging the client to take prescribed medications for their well-being.