Eight-Year-Old Mary Seems to Be Very Upset About Something and the School

Eight-year-old Mary seems to be very upset about something and the school psychologist believes there may be trouble in her home.In an effort to confirm his suspicion,the psychologist has Kay go to a room containing dolls,a toy kitchen,and other household items and "pretend to be a mommy taking care of her baby girl." This psychologist is using

A) behavior modification.
B) client-centered therapy.
C) a Piagetian approach.
D) play therapy.