The answer is C: implementing a plan of service for the client.
Explanation for each option:
a. Identifying client resources and strengths: This is a primary objective of interviewing. Understanding a client's resources and strengths is crucial for building a supportive relationship and developing effective strategies for addressing their needs.
b. Helping people explore their situation: This is also a primary objective of interviewing. The process of exploring a client's situation allows the interviewer to gather necessary information and helps the client gain insight into their circumstances.
c. Implementing a plan of service for the client: This is not a primary objective of interviewing. While developing a plan of service may be a subsequent step after the interview, the interview itself is primarily focused on gathering information, understanding the client's needs, and building rapport.
d. Helping people increase their understanding of the situation: This is a primary objective of interviewing. By discussing their situation with an interviewer, clients can gain a clearer understanding of their issues, which is essential for problem-solving and decision-making.