Final answer:
The nurse should display client advocacy by respecting the client's autonomy and encouraging open communication. Option C, 'Why would you not want to share this information with your children?' displays client advocacy by seeking to understand the client's reasoning for not wanting to share the diagnosis with their adult children.
Step-by-step explanation:
The nurse should display client advocacy by respecting the client's autonomy and encouraging open communication. Option C, 'Why would you not want to share this information with your children?' displays client advocacy by seeking to understand the client's reasoning for not wanting to share the diagnosis with their adult children. By asking this question, the nurse can explore the client's concerns and provide support and guidance without imposing their own beliefs or judgments.