According to Labeling Theory,why Were None of the Pseudo-Patients in David

Multiple Choice

According to labeling theory,why were none of the pseudo-patients in David Rosenhan's "On Being Sane in Insane Places" discovered?

A) They all were mentally ill, at least to some extent.
B) They were too "clean-cut" to be considered mentally ill.
C) They were well coached in the symptoms real patients would experience.
D) It is difficult for anyone to see past the label once a person has been labeled
"mentally ill."