Which of the Following Conclusions Can Be Drawn from Rosenhan's

Which of the following conclusions can be drawn from Rosenhan's study that used "pseudopatients"?

A) Most behaviour patterns are basically the same in people being diagnosed as abnormal.
B) The validity of diagnostic categories in DSM-III-R is very suspect in distinguishing between normal and abnormal persons.
C) Once one has been diagnosed as abnormal, subsequent behaviour gets interpreted in a manner consistent with the diagnosis.
D) Distinguishing between schizophrenic subtypes is almost impossible.