【单选题】

The passage provides information that would help answer all of the following questions except ______.
A．Who are some people who have had an important influence on the public health movement in the United States

B．What were some of the mental illnesses that were considered untreatable until the 1950s
C．What were some of the most important legal cases that contributed to the new concern for patients' rights
D．What were some of the new treatments for mental illness that were adopted in the 1950s