单选题 An elderly resident with the diagnosis of dementia of the Alzheimer's type frequently talk about the good old days at the ranch as a child. On the basis of an understanding of the resident's diagnosis, the nurse's most appropriate action at this time would be to
A．Involve the resident in interesting diversional activities in a small group
B．Allow the resident to reminisce about the past and listen with interest to the stories
C．Gently remind the resident that those "good old days" are past and thinking should focus on the present
D．Introduce the resident to other residents of the same age so that they can mutually share their past experiences