Which technique is widely used by therapists to help clients recover lost childhood memories?

A) hypnosis
B) "truth" serum
C) Gestalt therapy
D) electroconvulsive therapy

Hypnosis is a technique commonly used by therapists to help clients access repressed or forgotten memories, such as those from childhood. However, it is important to note that the validity and accuracy of these memories can be unreliable and are often subject to suggestion or manipulation by the therapist. Other techniques, such as cognitive-behavioral therapy and talk therapy, may also be used to help clients process and explore past experiences without relying on potentially unreliable memory retrieval methods. B is not a valid option as "truth" serum is not commonly used by therapists for memory retrieval, and C and D are not appropriate methods for this purpose.