What type of reflections either strengthen or weaken the expression of the client?

Amplification is the correct choice as it entails a technique that involves emphasizing or expanding upon what the client has expressed. By doing so, the social worker can enhance the client's feelings or thoughts, which can reinforce the importance of those expressions. This reflective practice can lead clients to explore deeper emotions or thoughts, ultimately strengthening their self-awareness and promoting engagement in the therapeutic process.

When amplifying a client's expression, the social worker is not merely repeating back what has been said but is also bringing attention to certain aspects of the client's experience with an intention to encourage further exploration of those feelings or thoughts. This can help validate the client's experiences, fostering a more profound and supportive therapeutic relationship.