In His Study of Mental Health Institutions,David Rosenhan Sent His

In his study of mental health institutions,David Rosenhan sent his research assistants,all with no history of mental health issues,to present themselves to different psychiatric hospitals and report hearing voices in their heads.Once admitted,what was the outcome?

A) All were quickly identified as not being mentally ill and released.
B) Half were quickly identified as not being mentally ill and released;half were not.
C) All were treated as if they were indeed mentally ill and were not released until they admitted to having a mental illness.
D) All eventually developed signs of mental illness.