Final answer:
The social worker should obtain a professional translator to ensure accurate and effective communication due to language barriers, which is the most ethical and efficient way to provide proper support for the client.
Step-by-step explanation:
In the scenario presented, the most appropriate action for the social worker would be D. Obtain a professional translator before proceeding with the interview. While the social worker might be tempted to ask the receptionist who is a native Mandarin speaker to translate, there are issues regarding confidentiality, professional boundaries, and potential lack of training in the nuances of translation, especially in a mental health context. Attempting to conduct the interview without assistance could lead to misunderstandings and compromise the quality of care. Referring the client to a different social worker does not address the immediate language barrier. It is essential to provide accurate and effective communication to understand the client's needs and experiences fully. Therefore, securing a professional translator skilled in both languages and familiar with the relevant medical and psychological terminology would be the most ethical and efficient choice to ensure proper communication and support for the client.