A nurse is caring for an older adult client who has dementia and is agitated. The client says, "I have to go home and see my mother." The nurse replies, "You miss your mother." Which of the following therapeutic techniques is the nurse using?

A. Guided imagery: Guided imagery involves creating mental images to promote relaxation, not applicable here. B. Orientation to reality: Reality orientation involves correcting misperceptions about time, place, and person, not used in this context. C. Remotivation: Remotivation involves stimulating a client's interest in the environment and is not applicable here. D. Validation: Correct. Validation acknowledges the client's feelings and emotions, supporting their sense of reality.